Preheat oven to 425 degrees.
Pat chicken dry.
In a small bowl, combine butter, 1 tsp berbere, and zest of one lime. Rub the butter under the skin of the chicken, carefully.
Rub the outside of the chicken with olive oil. Season with salt, pepper and remaining berbere.
Halve both limes and add them to the cavity of the chicken. Tie legs with twine. Add chicken to a roasting pan or cast-iron skillet.
Roast chicken for 75 minutes. Remove from oven and rest 10 to 15 minutes before carving.
Serve immediately with roasted potatoes or mashed potatoes and vegetables.