Sweet Potato and Spinach Curry Recipe

Name: Sweet Potato and Spinach Curry Recipe
Ingredients: 2 tablespoons canola oil; 1 tablespoon whole cumin seeds; 1 medium white onion, chopped (about 1 cup); 2 medium garlic cloves, minced (about 2 teaspoons); 1 inch piece fresh ginger, peeled and minced (about 1 tablespoon); 1/4 teaspoon ground cayenne pepper; 1 teaspoon sweet paprika; 1/2 teaspoon ground cardamom; 1 teaspoon ground cinnamon; 1 1/2 teaspoons kosher salt; 1 large sweet potato about (about 1 1/2 pounds) peeled and cut into 1-inch cubes; 1 cup water; 1 pound spinach, ends trimmed, leaves rinsed, and roughly chopped