Bayys Meatless Marinara from Scratch Vegan

Name: Bayy's Meatless Marinara from Scratch (Vegan)
Ingredients: 15 Roma (plum) tomatoes, diced; 2 cups water, divided; 1 (14.5 ounce) can diced tomatoes; 1 (6 ounce) can tomato paste; 2 (15 ounce) cans black beans, drained and rinsed; 1 (8 ounce) package mushrooms, diced; 1 green bell pepper, diced; 1 onion, diced, or more to taste; 1 stalk celery, chopped, or more to taste; 2 cloves garlic, minced, or more to taste; 2 tablespoons olive oil; 2 tablespoons fennel seeds (optional); 2 cubes vegetable bouillon, or more to taste; 2 sprigs fresh parsley, chopped; 2 leaves fresh basil, chopped; dried Italian seasoning to taste; salt and ground black pepper to taste