ingredients 1 tablespoon olive oil 1 tablespoon butter 1 large sweet onion, halved widthwise and thinly sliced 2 cloves garlic, finely chopped 1 teaspoon dried thyme 1 pound ground beef (whatever blend you prefer) Salt and ground black pepper 1 (12-ounce) bottle beer, whatever variety you like 1 tablespoon Worcestershire sauce 1 teaspoon Dijon mustard…