Cook onions over medium-high heat until all water has evaporated and they begin to brown/stick to pan (Do not add any salt)
Deglaze with ~4oz of beef bone broth at a time, stir and boil until liquid is completely reduced, and repeat until you've fully reduced 16oz of bone broth into the onions
Add a splash of soy sauce for extra flavor + color
Place meat mixture in a bowl and refrigerate for ~20 minutes. This helps it thicken/makes rolling burritos 100x easier
When transferring meat mixture to a bowl to refrigerate, place the bowl on a scale and weigh the filling. This makes it extremely simple to make perfectly evenly sized burritos - take the total weight, divide by 14, and this is the amount that goes in each burrito
Reheat instructions: remove from freezer, wrap in a paper towel, microwave for 2 minutes to defrost, then air fry at 375 for 6-8 minutes to crisp up your tortilla
