Jambalaya can have sausage, chicken, shrimp, or duck, tomatoes or no tomatoes; gumbo can be thick or thin or dark or light.
So people stayed home and cooked big pots of red beans and gumbo.
The cafeteria style stop is basically a comfort food joint—think baby back ribs, shrimp and grits, and gumbo—done well.
1805, from Louisiana French, probably ultimately from Central Bantu dialect (cf. Mbundu ngombo "okra").