Smoky Lentil Stew with Leeks and Potatoes (vegan)

Name: Smoky Lentil Stew with Leeks and Potatoes (vegan)
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: American
Ingredients: 4 stalks celery - finely chopped; 2 leeks - separated from green stalks and finely chopped; 4 garlic cloves - minced; 4 cups diced potatoes - from 3-4 red potatoes; ½ cup basil - finely chopped; ½ cup brown lentils; ½ cup farro; 4-6 cups vegetable broth (adjust to your thickness preference, I used 5 cups); ½ cup marinara sauce (could subbed crushed tomatoes); 1 tbsp balsamic vinegar; juice from ½ lemon; 1 tsp liquid smoke (this gives the smoky flavor); 1-2 teaspoon salt (or to taste); black pepper to taste; 1 tsp paprika; 1 tsp dried thyme; pinch cayenne or red pepper flakes