Turn the stove to medium and add the oil or schmaltz in a large heavy bottomed pan (I like to use my Le Creuset braiser).
While the oil is heating, take out a large cutting board and cut up your veggies. I like to mince my garlic very fine, do a small dice on my onion, and slice the mushrooms.
When the oil is glistening and hot, toss in the mushrooms. Cook them for a few minutes until all the water has been drawn out, then add the onions and garlic and cook until the onions are translucent and the garlic is fragrant.
As soon as the veggies are ready, pour in the farfel: add more oil/schmaltz if needed. Mix it up, and allow it to toast for a few minutes before pouring in the stock.
Once all the stock is in the pan add the salt and leave it to simmer, uncovered, until the chicken timer goes off (likely another 20 or so minutes).