Preheat oven to 350°F (175°C).
Blanch 3 cups nettle tops in boiling water for 1–2 minutes. Drain, squeeze dry thoroughly, and chop.
Line a pie pan with 1 prepared pie crust and prick the base with a fork.
Sauté 1 garlic clove, 1 shallot, and 3 scallions in a little oil until softened.
Spread nettles and sautéed vegetables over the crust. Add 7 oz feta cheese.
In a bowl, whisk 3 large eggs with ½ cup crème fraîche, the zest of 1 lemon, 2 tablespoon fresh mint, Salt and black pepper.
Pour over the filling. Bake for 25–30 minutes until set and lightly golden.
Toast 2 tablespoon pine nuts in a dry skillet and sprinkle over the quiche before serving.