Cod with Sweet Potato "Salad"

So good you'll dance (I should trademark that!)

One chunk cod
One sweet potato, peeled and cut into chunks
One red (or yellow, or orange) pepper, cut into strips
One onion, cut into small wedges
Olive oil
Fresh basil and parsley
Dessertspoon mayonnaise
A few drops tabasco sauce
Pinch freshly-grinded pepper

Place cod, potato, pepper and onion in a large piece of cooking foil on a baking tray. Drizzle with olive oil and tear the herbs over it. Fold foil over food like a parcel.
Cook at gas mark 6 (400 F 200 C) for about half an hour or until the cod is cooked.
Mix the mayo, tabasco and pepper together, use as a dressing for the food.
Mmmmmmmm