This is the well-known appetizer, which we traditionally prepare for Christmas Eve. We like it so much that we could eat it all the year round as pesto.
½ small garlic head (or to taste)
2 cups walnuts
1 cup water
salt to taste
vinegar to taste
Blend all the products in a blender until a thick creamy mixture is obtained.
Always, the ratio walnut/water is 2:1. My suggestion is that you start with less water and add gradually, if necessary.