Spicy Chickpea Tagine

1/2 onion , chopped

1 (15 ounce) can chickpeas , drained & rinsed

1 (15 ounce) can diced tomatoes

1 tablespoon fresh Italian parsley , finely chopped

1 tablespoon fresh cilantro , finely chopped

1/4 teaspoon salt

1/4 teaspoon black pepper

1/4 teaspoon harissa (cayenne pepper can be substituted)

1/4 teaspoon cinnamon

1/4 teaspoon turmeric

1/4 teaspoon ginger

1/4 teaspoon cumin