Scatter the mushrooms, ham, and cheese in the tart shell and pour the custard on top. Bake the quiche for about 30 minutes, or until it is lightly browned on top and the custard is just set.
Gently fry the onion along with a pinch of salt for 5 minutes, or until just starting to colour. Add the mushrooms ... gently into the spinach mixture and pour over the eggs.
This high-rising, mushroom-packed quiche is anything ... his Bouchon cookbook, just might be the perfect example and is well worth the time it takes to prepare. Earthy spinach and tangy goat ...