Beef with cumin

1 tablespoon extra-virgin olive oil 2 tablespoons butter 2 pounds ground chicken breast 1 large carrot, peeled and finely chopped 1 large onion, chopped 3[...]

2 lbs fat-trimmed boned beef chuck , rinsed and cut into 3/4-inch chunks 1 onion , peeled and chopped (8 oz.) 2 garlic cloves , peeled and minced 1 -2[...]