A Really Good Cuban Sandwich

Name: A Really Good Cuban Sandwich
Ingredients: 1 ¼ Cup mayonnaise, such as Dukes; 1 large orange, for juicing; 1 lime, for juicing; 1 cloves garlic, mashed to a paste, about 4 teaspoons; 1 Tablespoon toasted and finely ground cumin seeds; 2 Teaspoons kosher salt; 1 bunch cilantro, leaves only, about 1 cup; 4 Cuban-style sandwich loaves, or 1 loaf brioche or challah bread, cut into eight ¾-inch thick slices; 2 Teaspoons yellow mustard; 1 Cup grated Gouda cheese (could be any kind of rich, easy-melting cows milk cheese); 1 Cup grated Gruyere cheese; 4 Ounces thick-sliced deli ham; 10 Ounces slow-cooked pork barbacoa, sliced; Dill pickle slices, preferably flat, thinly sliced cucumber dill pickles; Nonstick cooking spray