I got this one from my mom. It's simple and amazingly good. It's great on shrimp, chicken, and fish but also really good on steamed broccoli, greens, lima beans, and anything else you could think of.
Seafood Basting Sauce:
1-2 T Old Bay Seasoning
1 stick real Butter
1 finely diced small onion
2 finely diced garlic cloves
juice of one lemon.
Saute onion and garlic in butter . Add Old Bay and lemon and stir until incorporated.
Use as a glaze on grilled, baked or broiled fish, shrimp, crab, or scallops. If you like mild flavor, cut back on the Old Bay.