Julia's Fish Gratin

Feeds 2 hungry pigs:

• 75g gruyere cheese.
  
• 75g emmenthal cheese
• 3 tsp dijon mustard
• 4-5 tbsp single cream
• salt and pepper
• 18 cherry tomatoes
• 1.5 tbsp chopped basil
• 750g flat fish such as lemon sole or plaice, filleted and skinned
  

Preheat oven to 180C/4.
Grate all cheese, and place all cheese, mustard and cream into bowl and mix.
Season.
Half tomatoes, add basil and a little salt. Mix.
Spread half cheese mixture into gratin dish.
Lay half of the fish on top.
Place all of tomato mixture on top of fish.
Place second half of fish on that, and the rest of the cheese on top of that.

Transfer to oven for 20-30 mins.
Serve with potatoes and green salad.