Heat the oil or water in a large saucepan over medium heat. Add the garlic, carrot, scallions, marjoram, and red pepper flakes. Sauté for 3 minutes, stirring frequently. Stir in the edamame, chickpeas, tomatoes, and ½ cup of the broth. Cook for 15 minutes.
Add the remaining 1 cup broth and bring to a boil. Gradually stir in the couscous, then remove from the he