Start charcoal grill
In a large bowl, combine ½ cup pasilla sauce and short rib steaks, let sit until grill is ready. When ready, grill, making sure to get charcoaled edges. Let rest and rough chop in fairly small bite size pieces
In a medium saute pan, heat 1 tbsp cooking oil over medium heat, cook each tortilla (both sides) and place in foil to keep warm. You may need to add oil after cooking a few of the tortillas. You’re warming the tortillas quickly. They should still be soft
In a medium saute pan over medium heat, cook onions, dry without oil until softened and starting to char, set aside
In a small saucepan, heat ½ cup pasilla sauce (recipe below) over low heat
Assemble tacos: tortilla, 1 tsp pasilla sauce, about 2 tbsp short rib steak, ½ tsp pineapple, ½ tsp onion, ½ tsp cilantro, ½ tsp cotija cheese and squeeze lime