Multiple piece firebox for kamado grill

1. A firebox for a fuel-burning cooking vessel, the firebox comprising:

(a) a base defining a lower chamber of the firebox; and

(b) a bowl defining an upper chamber of the firebox, the bowl comprising two or more outwardly leaning side wall members removeably supported upon the base, the two or more outwardly leaning side wall members resting sequentially, edge to edge to the next side wall member about the base, wherein each of the side wall members comprise a joint configured to mate with a corresponding joint of another side wall member, wherein the inner face on one side of each side wall member overlaps with the outer face of an adjacent side wall member;

(c) wherein the upper chamber is in fluid communication with the lower chamber; and

(d) wherein when the firebox is inserted within the fuel-burning cooking vessel, each side wall member is separately removeable from the other side wall members.

2. The firebox of claim 1 wherein the side wall members are composed of a refractory material selected from the group consisting of ceramic, clay, terracotta and crushed lava rock.

3. The firebox of claim 1 wherein each of the side wall members are identically shaped.

4. The firebox of claim 1 wherein each of the plurality of side wall members further comprises a first vertical edge comprising a male connection and a second opposing vertical edge comprising a female connection.

5. The firebox of claim 1 wherein each of the side wall members further comprises a top portion, and the firebox further comprises a retaining member about the top portions of the side wall members.

6. The firebox of claim 1 further comprising a lower grate spanning the firebox proximate to a transition portion between the upper chamber and the lower chamber and wherein the lower grate further supports the side wall members.

7. A fuel-burning cooking vessel comprising a kettle formed by a floor and one or more upwardly-extending walls about the floor; and,

a firebox disposed within the kettle, the firebox comprising:

(a) a base on the floor, the base defining a lower chamber of the firebox; and

(b) a plurality of side wall members extending up from and removeably supported upon the base, the plurality of side wall members defining an upper chamber of the firebox, wherein the inner face on one side of each side wall member overlaps with the outer face of an adjacent side wall member such that each of the side wall members is separately removeable from the other side wall members.

8. The fuel-burning cooking vessel of claim 7 wherein each of the side wall members are supported between the base and the upwardly-extending walls of the kettle.

9. The fuel-burning cooking vessel of claim 8 wherein the side wall members are further supported by the grate.

10. The fuel-burning cooking vessel of claim 7 further comprising:

(a) a transition portion of the firebox between the lower chamber and the upper chamber; and

(b) a grate spanning the firebox proximate to the transition portion of the fire box.

11. The fuel-burning cooking vessel of claim 7 further comprising a grate spanning the firebox, the grate engaging a bottom portion of the side wall members.

12. The fuel-burning cooking vessel of claim 7 further comprising a grate spanning the firebox, the grate supported by an upper portion of the base.

13. The fuel-burning cooking vessel of claim 7 further comprising:

(a) a grate spanning the firebox;

(b) wherein a lower portion of at least a first of the side wall members engages the grate; and

(c) wherein an outwardly-facing portion of such first side wall member engages an inner surface of one of the upwardly-extending walls of the kettle.

14. The fuel-burning cooking vessel of claim 13 wherein the outwardly-facing portion further comprises a spacer.

15. The fuel-burning cooking vessel of claim 7 wherein:

(a) a lower portion of at least a first of the side wall members engages an upper portion of the base; and

(b) an outwardly-facing portion of the first side wall member engages an inner surface of the kettle.

16. The fuel-burning cooking vessel of claim 15 wherein the outwardly-facing portion further comprises one or more spacers.

17. The fuel-burning cooking vessel of claim 7 wherein the base is formed of a refractory material.

18. The fuel-burning cooking vessel of claim 17 wherein the refractory material is selected from the group consisting of ceramic, clay, terracotta and crushed lava rock.

19. The fuel-burning cooking vessel of claim 7 wherein the side wall members are formed of a refractory material.

20. The fuel-burning cooking vessel of claim 19 wherein the refractory material is selected from the group consisting of ceramic, clay, terracotta and crushed lava rock.

21. The fuel-burning cooking vessel of claim 7 wherein each of the side wall members further comprises a top portion, and the firebox further comprises a retaining member about the top portions of the side wall members.

22. The fuel-burning cooking vessel of claim 7 wherein each of the side wall members are identically shaped.

23. The fuel-burning cooking vessel of claim 7 wherein each of the plurality of side wall members further comprises a first vertical edge comprising a male connection and a second opposing vertical edge comprising a female connection.

24. A firebox for a fuel-burning cooking vessel, the firebox comprising:

a base defining a lower chamber of the firebox; and

a bowl defining an upper chamber of the firebox, the bowl comprising two or more side wall members removeably supported upon the base, the two or more side wall members resting sequentially, edge to edge to the next side wall member about the base, wherein each of the side wall members comprise a joint configured to mate with a corresponding joint of another side wall member such that each side wall member is separately removeable from the other side wall members and wherein the inner face on one side of each side wall member overlaps with the outer face of an adjacent side wall member.