Place a large skillet over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons.
In a large mixing bowl, combine ground sirloin, jalapeño, garlic, chili powder, cumin, hot sauce, scallions, salt and pepper. Form the meat mixture into four patties. Cook the patties in the hot pan until golden brown and cooked through, about 5 minutes per side.
While the burger patties are cooking, turn a gas burner onto high and blister the flour tortillas by passing them over the flame quickly. If you don't have a gas stove, place a dry skillet over high heat and lay the tortillas, one at a time, into the hot skillet, blistering them on both sides.