Ingredients: 2 1/2 cups club soda 1/4 cup unseasoned rice vinegar 2 tablespoons chopped fresh tarragon 1 1/2 teaspoon kosher salt 3-4 fresh tomatillos (about 6 oz.), husks removed, scrubbed, patted dry, and chopped 2 ripe avocados (about 1 lb.) 1 small cucumber (about 8 oz.), peeled and seeded 1 jalapeño, seeded 2 cups frozen […]