Heat the butter in a saucepan over medium heat. Saute the onions and cook, stirring occasionally, until golden brown, then add garlic. Stir until fragrant.
Add the cleaned lentils, 1T of berbere, tomato, and 4C broth to the saucepan.
Reduce heat to medium-low and simmer, stirring occasionally, until thick and the lentils are tender. This may take up to an hour.
Stir in the remaining berbere and season with salt. Once at the consistency you want serve either over a rice or with injera.
Ethiopian Spiced Clarified Butter (Niter Kibbeh): I have changed the recipe to use European unsalted butter. To make this clarified butter please go to this site.