Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   4      pounds        tri-tip or skirt steak, sliced 1/4" thick
   6                    limes, juice of
   6                    fresh jalapenos
   4      tablespoons   Mexican oregano, crushed
   1      quart         beer

Preparation:

Put all the ingredients in a blender jar and blend. Pour marinade over meat so that all of it is covered. You can do this in a glass bowl or in a 2 gallon Ziploc bag. Let the meat marinate in the refrigerator at least 6 hours, preferably overnight. Drain meat and grill over hot charcoal with direct heat method for about 5 minutes per side. Serve with warm flour tortillas and sautéed onions and bell pepper slices. Top with green taco sauce (tomatillo salsa).