This might just be the best blue cheese dressing you have EVER eaten!
Low FODMAP Serving Size Info: Makes about 1 1/2 cups (360 ml); 6 servings; serving size 1/4 cup (60 ml)
Simply gently whisk together the sour cream, yogurt, mayonnaise and lemon juice (or vinegar) in a small bowl. Stir in the blue cheese and season to taste with salt (if needed) and pepper. The dip/dressing is ready to serve, or it may be refrigerated in an airtight container for up to 2 days.
This makes a fairly thick dip. If you want it a little thinner for a salad dressing, you can whisk in a few drops of water or lactose-free milk until the desired consistency is reached.