oil, for sautéing

2 medium onions, chopped

2 pounds (1 kilogram) mushrooms, sliced (use button mushrooms or a combination of mushrooms like shiitake and portabella)

2 cups matzah farfel, such as Manischewitz Whole Grain Matzo Farfel

1/2 cup Manischewitz Chicken Broth or other chicken soup

1 teaspoon kosher salt

1/8 teaspoon pepper

1 clove garlic, crushed or 1 cube Gefen Frozen Garlic

5 stalks celery, sliced thinly