Crock pot curried lentil, chickpea, and quinoa stew

From the blog Eat This...

Crock pot curried red lentil, chickpea, and quinoa stew (adapted from ZestyCook/Closet Cooking)
(Printable version)

1 Tbsp oil
1/2 onion, chopped
1 carrot, diced
1 celery stalk, diced
3 garlic cloves, minced
1" piece of ginger, peeled and minced
1 Tbsp curry powder
1 1/2 cups red lentils
1 can (14 oz.) diced tomatoes
4 1/2 cups water
1 Tbsp hot chili sauce (I used Sriracha)
2 cups cooked chickpeas (or 1 can)
1 1/2 cups cooked quinoa*
1/2 cup cilantro, minced
salt and pepper to taste

Heat oil over medium heat in a medium skillet.  Add onion, carrot, and celery and cook until vegetables begin to get tender (about 8 min).  Add garlic, ginger, and curry powder, and saute for an additional minute.  Add this to a medium crock pot (I used a 3 1/2 quart, and it was almost too small) along with the lentils, tomatoes, water, chili sauce, and chickpeas.  Cook on high for an hour, and then cook on low for another 4 hours.  An hour before cooking is complete, add in quinoa.  At the end of the cooking time, stir in cilantro and season with salt and pepper.  Serves 6-8.

*You can substitute 1/3 cup uncooked quinoa, and add it to the crock pot at the beginning.  Add an additional 2/3 cup water.