Ratatouille Pasta Bake

Name: Ratatouille Pasta Bake
Ingredients: 1 red onion (diced); 2 cloves garlic (crushed); 1 teaspoon chilli flakes; 1 red capsicum (diced); 1 yellow capsicum (diced); 1 eggplant (cut into 3cm pieces); 2 zucchini diced; 700 g tomato passata (or puree); 1/4 cup water; 1 teaspoon oregano; 1/4 cup fresh basil (roughly chopped); 1 tablespoon olive oil (extra virgin); 250 g wholemeal spiral pasta (or gluten free spiral pasta); 1 cup cheddar cheese (or vegan cheese if you prefer); salt & pepper (to taste); 80 g mixed salad leaves; 1/2 lemon (juiced)