In a large crock-pot, add your roast, carrots and potatoes (or cabbage/turnip).
In a small bowl, whisk the remaining ingredients and pour over roast.
Cover crock-pot and cook on low 5-6 hours.
Notes
I used baby potatoes for this recipe to appeal to my children. If following the keto diet or watching your carbohydrate intake, simply substitute potatoes for chopped turnip or cabbage.