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Export 14 ingredients for grocery delivery
Step 1
Melt the butter in a large (12-inch) skillet over medium-high heat. Add the onion, season with salt, and cook, stirring, until the onion is translucent, about 5 minutes. Add half the diced apples and cook, stirring until softened, adjusting the heat as necessary to avoid scorching, about 5 minutes. Add the celery, garlic, sage and thyme, and stir to combine. Pour in the cider and let it come to a bubble. Scrape the mixture into a 6- to 8-quart slow cooker.
Step 2
Add the sausage, lentils, nutmeg, 1 teaspoon salt and a generous amount of black pepper to the slow cooker; pour in 3 cups water. Cover and cook on low until the lentils are tender and the flavors are mellowed and blended, about 8 hours. The soup holds well on the warm setting.
Step 3
Just before you are ready to eat, add the vinegar. Stir together the sour cream with the mustard, then stir the mixture into the soup. Taste and add more salt and pepper if necessary. Serve in bowls topped with the scallions and remaining chopped apple.