2-2 1/2 pounds yukon gold potatoes, peeled and chopped
1 red onion, chopped
1/3 cup cider vinegar
1/4 cup fresh parsley or dill, chopped
2 1/2 tablespoons whole grain mustard
1 1/2 tablespoons allpurpose flour / plain flour
1/2 teaspoon salt
1/4 teaspoon freshly ground pepper
1. In a small bowl, whisk together mustard and flour until combined, then stir in cider vinegar.
2. Place potatoes and onions in Slow cooker and pour mustard vinegar mixture over the top. Season with salt and pepper and stir everything together.
3. Turn Slow cooker on LOW and cook for 5-6 hours, or until potatoes are fork tender. Turn off heat and stir in fresh parsley or dill before serving. Serve warm or refrigerate until chilled.