In a large bowl mix together corn flour, baking powder, and salt.Add vegetable shortening and mix until it resembles coarse crumbs.
Slowly add warm water and keep kneading the dough until it becomes elastic and smooth. Cover the dough with a damp cloth and let it rest for about 30 minutes.
Divide the dough into 8-10 equal portions and make a ball of each portion.Roll each ball into a 6-7 inches circle using a rolling pin.
Heat the griddle over medium heat and carefully transfer one tortilla to the griddle.Cook the tortilla for 1-2 minutes from each side until it is slightly puffy.Fill the street taco tortillas with your favorite toppings and enjoy!!