Cook pasta or rice according to package instructions. Preheat the oven to 425°F.
Chop the thawed cod into chunks and blot both the cod and shrimp with a paper towel to remove excess moisture.
In a bowl, mix broth, lemon juice, olive oil, whole grain mustard, honey mustard, lemon pepper seasoning, and salt.
In an oven-safe dish, add the fish chunks and shrimp. Sprinkle green onions and drizzle the dressing over the top. Toss everything together.
Bake for 8-12 minutes, or until shrimp turns pink and cod is no longer translucent and easily flakes with a fork.
Use a slotted spatula to transfer fish to a plate. Place the leftover liquid in a stovetop-safe dish, bring it to a boil, then let it simmer for 5-8 minutes to reduce and thicken into a sauce.
Add pasta to plates topped with fish and shrimp. Drizzle the sauce over the fish. Serve and enjoy!