Melt the butter in a large saucepan over medium heat. Cook and stir the onion, garlic, and red pepper in the butter until the onion is soft. Add the squash, 2 tablespoons cilantro, salt, and pepper and stir continually for 5 minutes. Stir in the bouillon mixture and 1 tablespoon cilantro; cover. Simmer about 20 minutes.