Creamy Garlic Dip

I turn once again, to you (plural), my LTH friends who are so fabulous at ferreting out recipes.

I was at the Celtic Knot in Evanston a couple of weeks ago. I had a wonderful creamy garlic dipping sauce. It was slightly tangy and had brown spots in it reminiscent of mustard seeds.

One of the owners told me it was house made. When I e-mailed asking about getting the recipe, I was told that they don't share. However, he (Patrick -- chef? owner?) said "I assure you that simple is good and through trial and error you could come up with a great recipe yourself."

So, does anyone have a good base recipe? Has anyone else tried the version at the Celtic Knot and can help me approximate a recipe?

Thanks!

Garlic Dipping Sauce?