Heat oil in a large Dutch oven over medium heat. Add onion to pan; cook 15 minutes or until tender, stirring occasionally. Add ginger and garlic; cook 5 minutes, stirring frequently. Stir in tomato paste and Berbere spice; cook 1 minute, stirring to combine. Gradually add broth, stirring with a whisk until blended. Increase heat to medium-high; bring to a simmer.