Saucy Spiced Cod With Corn

Name: Saucy Spiced Cod With Corn
Ingredients: 5 Tbsp. unsalted butter; 2 garlic cloves, crushed; 1½ tsp. coriander seeds; ¾ tsp. cumin seeds; ¾ tsp. mild red pepper flakes or ½ tsp. crushed red pepper flakes; ½ tsp. ground turmeric; Kosher salt, freshly ground pepper; 1 tsp. soy sauce; 3 ears of corn, husked, kernels removed from cobs (about 3 cups); 4 5–6-oz. cod or other flaky whitefish fillets; Mint leaves and toasted sesame seeds (for serving)