Cut chorizo into 6 lengthwise strips. With long sharp knife,make 6 cuts,each about 5 inches deep,into the roast,twisting knife to enlarge slits.Fill each slit with a sausage strip.
On waxed paper,coat meat with flour.In dutch oven over medium high heat in hot olive oil,brown meaton all side.Remove meat from pan;pour off all but 1 tablespoon of drippings.
In drippings in dutch oven over medium heat,cook onions and garlic until onions are tender,about 5 minutes,stirring occasionally.Stir in remaining ingredients.Return meat to dutch oven,and heat to boiling.Reduceheat to low,cover and simmer for 31/2hrs,until meat is fork tender,turning meat occasionally.
With large spoon,skim any fat from liquid:discard bay leaf.Slice meat and arrange on warm platter,pour a little sauce over it,serve remaining sauce in gravy boat(to be spooned over rice if you like) Buen Provecho!!