Heat a cast-iron pan or dutch oven over medium heat.
Add the onions, garlic, carrots, and celery - cook stirring occasionally until they begin to soften which will take about 6 to 8 minutes.
Add the ground beef and sausage to the pan and for 8 to 10 minutes until it's almost cooked through.
Gradually add the wine in intervals, allowing it to evaporate before adding more.
Stir in the tomatoes, nutmeg, and bay leaf. Reduce the heat to low and let it simmer for an hour on very low heat.
Remove the bay leaf and stir in the milk. Cover the pan loosely and simmer for 20 minutes longer and serve over your favorite pasta.
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Notes
Serve bolognese sauce with your favorite pasta.Store leftover bolognese sauce in the refrigerator for up to 3 days.Freeze leftover sauce for up to three monthsFor an alcohol-free version, replace the wine with broth.