Lentil and farro soup

Name: Lentil and farro soup
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Cuisine: Italian, Mediterranean
Ingredients: 1/4 cup extra virgin olive oil; 1 medium onion (chopped); 2 carrots (chopped); 3 celery stalks (chopped); 4 garlic cloves (minced); 1 large can San Marzano tomatoes, whole ((28 oz can)); 1 small can fire roasted tomatoes, diced ((14 oz can)); 2 tbsp tomato paste; 1 cup brown lentils; 1 cup cooked farro; 6 cups low sodium vegetable broth; 1-1/2 tsp dried oregano; 1 tbsp dried basil; 1/2 tsp chili powder; 3 cups fresh spinach (chopped); 2 tbsp lemon juice; 1/4 cup fresh parsley (chopped); salt and pepper to taste