1.
In a large saucepan or pot, heat one tablespoon oil. Add onions and sauté until medium brown, about 35 minutes. Remove sautéed onions from pot and set aside.
2.
Add remaining one tablespoon olive oil to the pot. Add mushrooms and cook until liquid has cooked out and mushrooms are browned, an additional 20 minutes.
3.
Return onions to the pan and season with salt and pepper. If using wine, add it now, scraping the bottom of the pan to mix in all the browned bits. Allow alcohol to evaporate. Add chicken stock and stir, then bring to a simmer. Add meatballs to the sauce and simmer an additional five minutes.
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