Heat oil in a large skillet over medium high heat. Add sausage and saute for 3-5 minutes until brown. Remove the sausage from the pan and set aside to cool. Add the shallots and garlic to the pan and saute for 2 minutes. Stir in the vinegar and bring to a boil. Cook about 2 minutes, until slightly reduced.
Place the spinach, sausage and red onion in a heat-proof bowl. Add the dressing and toss to coat. The spinach will wilt slightly. Season to taste with salt and pepper.
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