6 tablespoons unsalted butter, very cold, cut into small pieces
1 tablespoon duck fat, very cold
1/4 cup gruyere, grated
1 egg, lightly mixed with a fork
2-3 teaspoons ice water
Pie Filling
Potatoes (small red) or fingerlings, sliced 1/8 inch thick - enough to make one slightly overlapping layer in the tart pan (like you would if making a apple tart). I used three medium red potatoes.
5 leaves of Rainbow Chard, stems minced and leaves rolled up and cut into a chiffonade
4 scallions, sliced
1 tablespoon duck fat or olive oil
3 eggs
3 tablespoons heavy cream
3 tablespoons creme fraiche
2 tablespoons whole grain dijon
2 tablespoons spicy dijon
1 teaspoon thyme
1 teaspoon tarragon
salt and pepper
1/4 gruyere cheese, very finely grated like on a microplane - measured fluffed - don't compact it
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