Add the onions to the pot and cook over medium heat, stirring occasionally, until tender and well browned, about 8 minutes. Adjust the heat as needed to prevent the onions from burning. Add 1 cup Guinness Irish Stout and simmer, scraping up the browned bits from the bottom of the pan, until the stout has reduced by half, about 2 minutes. Pour the onion and beer mixture into the bowl with the browned meat and turn off the heat.

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