Homemade Bleu Cheese Dressing Breaking

It looks like a very tiny amount of lecithin would work - from 1 to 10% of the weight of the oil, depending on the oil-water ratio. That might be too technical so perhaps start with a drop and see what amount holds it together. If you scroll down here you'll see charts for various applications: http://www.americanlecithin.com/leci_appfood.html.

I appreciate all the help. Have to admit I've never used lecithin in a recipe, but I see I can order it on the web. Can anyone give some advice on the amount to use? If I was making say 4 cups of Bleu cheese dressing, how would I know how much lecithin to put in?

BTW, I love Food Pickle for exactly this reason - I can ask amateur questions and not be looked down on!

I try to make blue cheese dressing in small batches so it's used up before it gets watery.

As harlikearmour mentions, lecithin might solve the problem. This goes back to the high school science experiment about emulsions: since oil and water don't mix, you need something that bonds to both so that when you whisk or stir the mixture, the ingredients get distributed throughout. But it probably won't stay mixed - the oil will likely float to the top.

It also sounds like perhaps the solids in your dressing are falling to the bottom. Do you have a step for thinning out the blue cheese before mixing it in?

I appreciate your frustration in finding the perfect blue cheese dressing - looking forward to trying poppy's here.

Here's my recipe for Blue Cheese Dip. It keeps in the fridge for about a week without breaking. If I want dressing, I simply add a little evaporated milk and adjust the seasonings. Two birds with one stone!

¾ cups Fat Free Yogurt, Plain
¼ cups Reduced Calorie Mayonnaise
1 cup Crumbled Blue Cheese
1 Tablespoon Red Wine Vinegar
1 Tablespoon Lemon Juice
¼ teaspoons Garlic Salt
¼ teaspoons Celery Seeds
2 dashes Worcestershire

Line a sieve with cheesecloth and place over a bowl. Add yogurt and allow to drain/thicken for about an hour in the fridge. Discard the liquid and mix all ingredients together until combined. If you want to make dressing, simply add a little evaporated milk until you reach the desired consistency

You probably need to add an emulsifier such as lecithin to get it to be more stable. Otherwise you will have to just make it fresh as needed.