Moroccan Lentil and Vegetable Stew

Name: Moroccan Lentil and Vegetable Stew
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: Mediterranean
Ingredients: 1 onion (large); 3 stalks celery; 2 carrots (small); 2 gold potatoes (medium); 2 cups cauliflower florets; 1.5 cups lentils (green or brown); 6 cups vegetable broth (low sodium); 14.5 ounces diced tomatoes (canned); 1/4 cup tomato paste; 2 handfuls shredded kale; 2-3 tablespoons Ras el Hanout; 1 squeeze lemon juice; salt and pepper (optional, to taste); fresh parsley (optional, for garnish)