28 oz whole peeled tomatoes 1 can with liquid 1 3/4 cups vegetable stock 1/2 small yellow onion 3 cloves garlic 3 tbsp tomato paste 1 1/2 tbsp sugar or other sweetener 1 tsp italian seasoning 1/2 tsp salt 1/2 tsp pepper 3 tbsp butter or butter substitute fresh chopped basil for garn