If you are making spaghetti squash as part of your prep ahead, preheat the oven to 350 and follow the instructions on how to cook your squash in the link above.
On a cutting board, cut up all your veggies.
Heat olive oil in a skillet over medium heat. Add onion, celery, carrot, and cook until softened about 10 minutes.
Add the garlic and tomato paste and cook for 1 minute.
Next add tomato sauce, diced tomatoes, basil, oregano, baking soda and salt and pepper.
Stir in lentils, water and broth until well combined.
Simmer for about 25 minutes until lentils are softened.