Heat oil in a large skillet or pan over medium heat. Add the garlic and cook, stirring for about 1 minute. Add the spices and cook for another minute or until fragrant.
Add the beans and reserved liquid, tomatoes, and large pinches of salt and pepper. Heat for 10-15 minutes, mashing the beans a little with the back of a spoon. Stir in the cilantro or parsley and lemon juice. Taste and add more salt and pepper if needed.
Drizzle the tahini sauce over the beans and top with chili oil if desired. Serve with gluten-free crostini or crusty bread.