Quinoa Vegetable Soup

Name: Quinoa Vegetable Soup
Prep time: 10 min
Total time: 10 min
Cuisine: American
Ingredients: 2 tbsp. extra-virgin olive oil; 1 medium onion, chopped; 2 carrots, peeled and cut into thin rounds; 2 stalks celery, thinly sliced; 3 cloves garlic, thinly sliced; 1 large zucchini, cut into 1/2" pieces; 1 (14.5-oz.) can diced tomatoes; 1 (15.5-oz.) can cannellini beans, rinsed and drained; 1 c. quinoa; 1/2 tsp. ground cumin; 8 c. low-sodium vegetable broth; 8 oz. Tuscan kale, ribs removed and leaves thinly sliced; 1 tbsp. fresh lemon juice; Crushed red pepper flakes, for serving