Ingredients

1 cup all-purpose flour, plus more for rolling 1/3 cup whole wheat flour 9 tbsp cold butter, diced 1 tsp chopped thyme 45 tbsp ice water 1 tbsp butter 1 tbsp olive oil 1 large onion, thinly sliced 1 tsp sugar pinch of freshly grated nutmeg 1 cup shredded Gruyere cheese 3/4 cup half-and-half 3 large eggs 1 tsp Dijon mustard salt and freshly ground black pepper

Description

This Vegetarian Tart, With Crisp, Thyme-flavored Pastry, Is Equally Delicious Warm Or Cold.

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