Vegan Spanakopita

Name: Vegan Spanakopita
Ingredients: 1 medium onion, finely chopped; 2 tablespoons olive oil; 1 (10 ounce) package frozen chopped spinach, thawed (drained and squeezed dry); 1 (14 ounce) package soft tofu, drained (or silken); 1 tablespoon fresh dill (OR 1/2 teaspoon dried dill weed); 1 tablespoon lemon juice; 1⁄4 teaspoon salt and pepper, each; 1 (16 ounce) package phyllo dough, frozen (thawed); 1⁄2 cup margarine, melted (e.g. Earth Balance)