Instructions: Preheat oven to 400F. Grease pie plate 10x1 1/2".

Cook onions and butter in 10" skillet over low heat, stirring occasionally, until onions are a light brown.

Sprinkle tuna, 1 cup of cheese and onions in plate.

Beat eggs, milk, salt and pepper till smooth 15 seconds in blender on High or 1 minute with hand beater. Pour into plate.

Bake till knife inserted in centre comes out clean, 25 to 30 minutes. top with tomato slices and remaining cheese is melted 3 to 5 minutes. Cool 5 minutes.

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