Baked Salmon Alfredo with Shallots

WHAT YOU'LL NEED

• 4 salmon or halibut fillets, (about 500 g.)
• 1 Tbsp. (15 mL) margarine
• 2 large shallots or 1 small onion, sliced
• 1 1/2 cups (375 mL) 2% milk
• 1/4 cup (50 mL) water
• 1 Knorr® Alfredo Pasta Sauce Mix
• 1/2 tsp. (2 mL) grated lemon peel
• 1 cup (250 mL) frozen green peas, partially thawed