Asparagus, Goat Cheese and Tarragon Tart 4-ounces soft goat cheese, at room temperature 1 large egg, at room temperature, lightly beaten,1 large garlic clove, finely grated or minced1-½ tbsp. fresh tarragon leaves, chopped, plus more for serving½ tbsp. lemon zest, finely grated½ tsp. fine sea salt, plus more for sprinkling Pinch of nutmeg, freshly grated1 cup sour cream, at room temperature