This is from a vegetarian slow-cooker recipe book I have. It's tomato soup with a great twist! Filling, tasty, and perfect for cold days. Serve alone, with salad, or grilled cheese! Last time I made it, I did not have bay leaves or basil. Instead, I added Italian seasoning before pureeing the soup. This is a soup that is easy to adjust depending on what kinds of seasonings you have on hand.
Heat the oil in a medium-sized skillet over medium heat. Add the onion and garlic, cover, and cook until softened, about 5 minutes.
Transfer the onion and garlic to a 4-quart slow cooker. Add the stock, tomatoes, tomato paste, sugar, and bay leaves, and season with salt and pepper. Cover and cook on Low for 6 to 8 hours. Remove the bay leaves. Puree the soup in a food processor or blender, or use an immersion blender to puree it in the slow cooker. Adjust the seasonings.
To serve, spoon about 1/4 cup of cooked couscous into the bottom of each bowl, ladle the hot soup on top, and serve sprinkled with the basil.