Heat tortillas in the microwave on reheat setting (70% power) for one to two minutes. I like to use a tortilla warmer, but if you don't have one you can loosely wrap them in a clean kitchen towel.
While tortillas are warming, mix together the flour and water and set near the taquito assembly area.
Working quickly while the tortillas are warm, place equal portions of pork, cilantro and red onions in a thin line on the tortilla. Roll tightly and add a strip about two inches wide of the flour and water mixture. Finish rolling and set aside, seam side down.
Add the oil to a frying pan and place it over medium heat. Using a reliable quick read thermometer, heat the oil to 350°F.
Working in batches of 4-6, place the taquitos seam side down in the hot oil and allow them to fry. After one minute, start to roll them over and fry on all sides.
Remove from oil and place on a paper towel to absorb excess oil. Serve while hot.