Savoury cheese and onion pie

Shortcrust pastry made with:
8oz plain flour
6oz butter
lemon juice

10oz cheese, (1/2 gruyere)
2 tbsp flour
2 large onions
4 tbsp butter
1 tsp chopped basil
2 large firm tomatoes
2 large eggs
1/4 pint cream
nutmeg

Line flan dish with shortcrust pastry. Grate cheese and toss with flour. Slice onions and saute in butter gently (1/2 hour). Spread 1/2 of cheese on bottom of pie dish, then spread onions over. Slice tomatoes and heat in butter. Arrange on top of onions. Cover with remaining cheese. Beat eggs with cream and pour over cheese. Sprinkle with nutmeg. Bake 35-40 mins Gas 6/200C.