Wash, peel ( if needed), and dice all the vegetables( except the mushrooms & diced tomatoes). Toss all of the veggies into a food processor.
Pour 2-3 tbsp of vegetable oil into a large pot. Turn the heat on medium.
Add all of the minced vegetables into the pot
Add in the tomato sauce, diced tomatoes, seasonings, and garlic.
Pour in 3 cups of water, and mix until everything is well combined.
Toss in the mushrooms, and fold in.
Sprinkle 2 tsp of crystalized lemon, or pour in 2 tbsp of lemon juice.
Stir everything, and let simmer over medium heat for 45 minutes.
Let cool, pour the sauce into freezer bags, and freeze for up to 3 months or so.