Pan-Grilled Tilapia with Lemon and Red Onion

Ingredients (9)

• ✓ ¼ large lemon
• + 1 (6 ounce) tilapia fillet, patted dry add to pantry
• ✓ salt and ground black pepper to taste
• + salt and ground black pepper to taste add to pantry
• + 1 tablespoon extra-virgin olive oil add to pantry
• + 1 teaspoon butter, divided add to pantry
• + ¼ large red onion, coarsely chopped add to pantry
• + 1 teaspoon minced garlic add to pantry
• + 1 tablespoon grated fresh Parmesan cheese add to pantry