Spicy Baked Cod Fillets Recipe

Name: Spicy Baked Cod Fillets Recipe
Ingredients: for marinade; 2 tbsp plain non-fat yogurt; 1 tsp ginger-garlic paste; 2 tbsp tandoori masala paste; 2 tsp canned pureed tomatoes; 1 tsp soy sauce; 1 tsp white vinegar; 5 tbsp lemon juice; 1 egg, beaten; 2 1/2 tbsp cayenne pepper , or amount to taste; 2 tbsp ground coriander; 2 tbsp ground cumin; 1 tsp ground turmeric; 1/2 tsp salt , or to taste; 1/2 tsp fresh-ground black pepper; 5 (6 oz) cod fillets, rinsed and dried with paper towels; 2 tsp butter; 2 tbsp olive oil; 2 tsp chopped fresh cilantro, for garnish; 1 lemon, cut into wedges; 1/2 red onion, thinly sliced