Chana Masala Pockets with Tofu and Arugula

Name: Chana Masala Pockets with Tofu and Arugula
Ingredients: 14 ounces package extra firm or firm tofu, excess water removed and crumbled; 1.5 cups chopped onion; 28 ounces can crushed tomatoes; 16 ounces chickpeas; 1 cup arugula; 2 teaspoons coriander powder; 2 teaspoons cumin powder; 1 teaspoon garam masala; 1/4 teaspoon salt; 1/2 teaspoon ginger powder; 1/4 teaspoon cayenne; 1 1/2 tablespoons coconut oil; 1 tablespoon minced garlic; 2 tablespoons lemon juice; 6 pieces pita pockets cut in half; 1/4 cup vegan sour cream