Heat a pot over medium heat. Once hot, add the oil. Sauté the onion, carrot, celery, and garlic until they start to soften. Stir in the broth, diced tomato, thyme, and lentils. Bring to a simmer and cook for about 20 to 30 minutes until the lentils are soft and the soup builds flavor. Add more broth if needed.
Preheat the oven to 350°F (176°C).
Stir in spinach and remove the thyme sprigs. Season with salt and pepper to taste.
Mix all the ingredients together for the mocktail. Serve over ice if desired.
Warm the rolls in the oven for 2 to 3 minutes. Optional: Cut in half and spread with butter if desired.