Cut your chuck into large chunks. Add salt and pepper to taste.
Pressure Cooker Method: Sear the beef in your pressure cooker until browned. Add garlic, onion, tomato, maggi, oregano, salt, water and cilantro. Set pressure cooker on high and cook for 75 minutes.
Oven Method: Preheat your oven to 325℉. Sear the beef in a dutch oven until browned. Add garlic, onion, tomato, maggi, oregano, salt, water and cilantro. Bake for 3-3.5 hours.
Boil the potatoes in salted water until fork tender. Strain and let them sit on the strainer to dry them out.
Remove the beef from the pot and shred. Strain the broth and reserve at least 1 cup for the sauce.
Using a ricer, add the potatoes into the beef and mix well. Season to taste.
Salsa Verde (green sauce)
Add your salsa verde veggies to a baking sheet, add oil, salt and pepper and broil on high for about 12-15 minutes (tossing halfway through) or until charred and soft. Peel the poblanos and garlic and then blend everything along with the reserved beef broth from earlier and cilantro.
Salsa Roja (red sauce)
Add everything for the red salsa verde to a saucepan along with the reserved beef broth from earlier and bring to a simmer. Simmer for 8-10 minutes until everything is soft. Blend everything.
Flautas
Place your tortillas in the microwave so they are soft and pliable.
Add the beef and potatoes to one corner of the tortilla and roll pretty tightly.
Fill a pan with oil, about 1 inch. Preheat to 325°F. You can use a thermometer or put a wooden spoon in the oil to see if it starts bubbling around it.
Fry your flautas fold side down so it gets sealed and they keep their shape. Fry for about 3 minutes and flip them. Fry until nice and golden. Should be about 5-7 minutes total.
Serve the flautas over the red and green salsa. Top with lettuce, crema, queso fresco, pickled onions, lime and that is it!