Put the peppers, courgettes and onion on a large ... Season the fish with black pepper and wrap each fillet loosely with a slice of ham. Remove the tray and make gaps for the fish.
Preheat the oven to 190C/170C Fan/Gas 5. To make the wraps, put the ricotta in a bowl and stir until smooth. Add the remaining ingredients and mix until they are well combined into a loose batter.