Created by ForeverMama on January 4, 2015
Step 1: In a 12" ovenproof nonstick frying pan, melt 1 tablespoon of the butter over moderate heat. Add the scallions and cook, stirring, for 1 minute. Add the spinach, dried tarragon, if using, and 1/8 teaspoons each of the salt and pepper. Cook, stirring frequently, until the liquid evaporates, about 3 minutes. Remove the spinach mixture and let cool. Wipe out pan.
Step 2: In a large bowl, beat the eggs with the remaining 1/8 teaspoon each salt and pepper. Stir in the spinach mixture and fresh tarragon, if using.
Step 3: Heat the broiler.
Step 4: In the same frying pan, melt the remaining 1 tablespoon butter with the olive oil over moderate heat. Pour in the egg mixture and reduce the heat to low. Sprinkle the feta over the top and cook until the bottom is golden brown and top is almost set, 6 - 7 minutes.
Step 5: Broil the frittata 6 inches from the heat, if possible, until the eggs are set, 2 - 3 minutes.
Step 6: Lift the upper edge of the frittata with a spatula and slide the frittata onto a plate. Cut into wedges and serve.