Preheat the oven to 200 degrees F.
Trim the fat from the beef
, and cut the beef into strips. Put the beef, onions
, fennel, and roasted garlic into a large braising pan. Season the mixture with salt, and pepper. Pour the beer over the ingredients in the pan, submerging them. Cover the pan tightly with two layers of aluminum foil. Cook the stew
in the oven for 8 hours. Transfer the stew to bowls, and garnish
with fennel fronds.