Add the coleslaw, or broccoli slaw mix, and toss until well coated. Chill in the refrigerator while you make the tacos. Toss again right before serving the tacos.
Add the flour, baking powder, and cornstarch and pour in the beer a little at a time until it reaches thick batter-type constancy. Mix thoroughly. Let it rest for about 5 minutes.
Dip shrimp into the batter, allow the excess to drip off, and immediately place the shrimp in the hot oil. Let the shrimp cook, attended until one side is puffed and golden, about 2 minutes.Use tongs and turn them over and cook until golden on the other side, about 2 minutes more.
Place tortilla shells over an open flame and watch the bottom closely. They brown really fast, about 30 seconds. Use a pair of tongs to turn it over and brown the second side. Again, watch the bottom closely so it doesn’t get too blackened.