Easy Citrus Fish - TK

Ingredients

• 4 fillets of cod, mahi or other thicker, firm white fish
• 2 tablespoons unsalted butter
• 1/2 white or yellow onion, finely chopped or grated
• 2 garlic cloves, minced
• Juice and zest of 1 grapefruit (you can also use a 2 oranges if you prefer)
• 2 tbsp fresh parsley, chopped (optional for garnish)
• Salt and pepper to taste