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A grill accessory creates a steaming chamber on a grill that has a heat source and a rack of spaced-apart bars over the heat source. The grill accessory includes a cover configured that covers a food item and forms a steaming region below the cover. The cover operates in connection with a vapor gene

A grill accessory creates a steaming chamber on a grill that has a heat source and a rack of spaced-apart bars over the heat source. The grill accessory includes a cover configured that covers a food item and forms a steaming region below the cover. The cover operates in connection with a vapor generator that receives and holds fluid beneath the cover. The vapor generator has at least one vent opening to release steam into the steaming chamber. The grill accessory is configured so that it can rest upon the grill rack of spaced-apart bars, and so that the vapor generator transmits heat to the fluid in the vapor generator to convert the fluid to steam. The vapor generator releases the steam through the vent opening(s) into the steaming region below the cover. The steam can help melt toppings and/or introduce moisture into food items cooked on the grill.

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1. A grill accessory that creates a steaming chamber on a grill, the grill having a heat source and a rack of spaced-apart bars over the heat source, the grill accessory comprising: a cover configured to at least partially cover a food item, the cover having a bottom opening and an inner surface, th

1. A grill accessory that creates a steaming chamber on a grill, the grill having a heat source and a rack of spaced-apart bars over the heat source, the grill accessory comprising: a cover configured to at least partially cover a food item, the cover having a bottom opening and an inner surface, the inner surface and the bottom opening defining a steaming region within the cover, the cover further having an intake port configured to introduce fluid into the steaming region; anda vapor generator configured to receive and hold fluid within the steaming region, the vapor generator having a peripheral trough extending around at least a portion of an inner periphery of the cover within the steaming region, and at least one vent opening, the peripheral trough being in fluid communication with the intake port,wherein the grill accessory is configured to be supported by the rack of spaced-apart bars on the grill, wherein the vapor generator is configured to transmit heat to the fluid in the vapor generator so that the fluid converts to steam and to release the steam through the at least one vent opening into the steaming region below the cover, wherein the cover is configured to maintain at least a portion of the steam in the steaming region, and wherein the vapor generator is attached or attachable to the cover so that the cover and the vapor generator can be lifted off the grill in a single action. 2. The grill accessory of claim 1, wherein the peripheral trough comprises an outer wall, a lower surface, and an inner wall, wherein a portion of the inner surface of the cover forms the outer wall of the peripheral trough. 3. The grill accessory of claim 2, wherein the vent opening is defined by the outer wall of the peripheral trough and an upper rim of the inner wall of the peripheral trough, and wherein the inner wall and the outer wall of the peripheral trough are convergent to inhibit fluid from splashing out of the open top. 4. The grill accessory of claim 2, wherein the vapor generator comprises a fluid transfer device extending from the intake port to the peripheral trough, the fluid transfer device configured to guide fluid introduced through the intake port to the peripheral trough. 5. The grill accessory of claim 4, wherein the fluid transfer device comprises a conduit connected to the intake port, wherein the grill accessory is configured so that fluid received through the intake port enters into the conduit, and wherein the conduit is coiled at least partly around the inner surface of the cover, the conduit comprising at least one vent opening. 6. The grill accessory of claim 4, wherein the fluid transfer device is a conduit that extends along the inner surface of the cover from the intake port to the peripheral trough. 7. The grill accessory of claim 1, further comprising a closure for the intake port, the closure being movable between an open position that allows for the receipt of fluid and a closed position that inhibits egress of steam through the intake port. 8. The grill accessory of claim 7 wherein the closure comprises a spring-loaded member configured to deflect inward to the open position in response to pressure applied from a spout of a fluid source. 9. The grill accessory of claim 1, wherein the vapor generator is removably attachable to the cover. 10. A method of preparing a food item on a grill having a heat source and a rack of spaced-apart bars over the heat source, the method using the grill accessory of claim 1 comprising: at least partially cooking the food item on the grill;placing a meltable topping on the food item;placing the cover over the food item, the cover having a bottom opening and defining an interior region below the cover;generating steam with the vapor generator, the vapor generator comprising at least one vent opening; andmaintaining the steam in the interior region below the cover until the meltable topping melts on the food item. 11. The method of claim 10 wherein the step of generating steam with a vapor generator comprises introducing fluid into the vapor generator through an inlet port in the cover and closing the inlet port with a movable closure that inhibits the egress of steam out of the inlet port. 12. The method of claim 10 wherein the vapor generator comprises a conduit having at least one opening that allows steam to escape from the conduit, and wherein the conduit is connected to an inlet port in the cover, wherein the step of generating steam comprises introducing fluid from a fluid source into the conduit through the inlet port and heating the fluid to boiling, and emitting steam through the at least one opening into the interior region below the cover. 13. The method of claim 10 wherein the cover remains in place over the food item for a time period of between about 5 seconds and about two minutes. 14. The method of claim 10, wherein the vapor generator is separated or separable from the cover and is supportable by the spaced-apart bars over the heat source, wherein the method further comprises introducing fluid to the vapor generator prior to placing the cover over the food item, wherein the step of placing a cover over the food item further involves covering the vapor generator, and wherein the step of generating steam with a vapor generator comprises converting the fluid in the vapor generator into steam via heat from the heat source. 15. The grill accessory of claim 1, wherein the peripheral trough extends around the bottom opening of the cover so that the lower surface of the peripheral trough is generally coplanar with the bottom opening of the cover. 16. The grill accessory of claim 1, wherein at least a portion of the vapor generator is formed from a heat conductive material. 17. The grill accessory of claim 16, wherein the heat conductive material is configured to absorb heat from the grill and to transfer at least a portion of the absorbed heat to a fluid introduced into the vapor generator via the intake port. 18. The grill accessory of claim 17, wherein the heat conductive material is configured to effect a flash of steam upon introduction of fluid through the intake port. 19. The grill accessory of claim 1, wherein the cover, the intake port, and the vapor generator are configured so that fluid can be introduced to the vapor generator while the cover is covering the food item without lifting the cover. 20. A grill kit for use with a grill that has a heat source and plurality of spaced-apart bars over the heat source, the grill kit comprising: a grill steamer comprising: a cover configured to at least partially cover a food item, the cover having a bottom opening and an inner surface, the inner surface and the bottom opening defining a steaming region within the cover, the cover further comprising an inlet port configured to introduce fluid into the steaming region;a vapor generator connected or connectable to the cover so that the cover and a connected vapor generator can be lifted off the grill in a single action, the vapor generator comprising a fluid conduit in fluid communication with the inlet port, the fluid conduit extending around at least a portion of an inner periphery of the cover within the steaming region, the fluid conduit having at least one vent opening, the vapor generator configured to receive fluid through the inlet port and to transmit heat to the fluid so that the fluid converts to steam, and to release the steam to the steaming region through the at least one vent opening; andan inlet port closure that moves into an open position in response to being pressed inward, the inlet port closure being biased toward a closed position when no pressure is applied to the closure; anda bottle comprising: a container for storing a fluid; anda spout that controls the release of fluid from the bottle;wherein the grill steamer is configured to rest upon the spaced-apart bars on the grill, and wherein the vapor generator is configured to convert the fluid in the vapor generator into steam upon exposure to heat, and to release the steam through the at least one vent opening into the steaming region within the cover, and wherein the spout of the bottle is configured to press the inlet port closure to an open position and to introduce fluid stored within the bottle into the vapor generator.