In a small bowl, whisk together buttermilk, mayonnaise, lemon juice, dill, salt, sugar, and pepper until completely. Taste and adjust seasonings as desired.
Store dressing in the refrigerator for up to 1 week until ready to use.
Notes
This is a thin, pourable dressing. If you prefer a thicker salad dressing or a dip for vegetables, simply add more mayo to reach desired consistency.
To make this buttermilk dressing for coleslaw, you'll want a thicker consistency because the cabbage and other veggies in coleslaw release liquid and will otherwise make the sauce too thin and watery. As a result, I suggest using about ½ to ¾ cup mayonnaise and adding 1-2 tablespoons of sugar for that classic sweet coleslaw taste. This is our favorite coleslaw dressing recipe.
For a buttermilk ranch dressing, add extra fresh herbs or dried herbs, such as parsley and chives, garlic or garlic powder, onion or onion powder, sour cream, and Worcestershire sauce.