Found in the kitchen of our new house: a rack the size of a standard oven. Any ideas? There’s no way I’m throwing this away; I better know what this is

Ingredients (Curiosity Essentials)

1 large kitchen rack, dimensions roughly equal to a standard oven

4–6 baking trays or flat pans that fit the rack

Assorted seasonal vegetables (carrots, bell peppers, zucchini, onions)

Choice of proteins: chicken breasts, fish fillets, tofu, or beef cuts

½ cup olive oil or melted butter for coating

2 tsp kosher salt