Skordalia (Greek)

4 thick slices bread, soaked in water
1 1/2 cups mashed cooked potatoes
3 cloves garlic
1/2 cup walnuts
3/4 cup olive oil
1/3 cup fresh lemon juice
1/2 teaspoon salt

Squeeze bread to remove excess water. Place bread, potatoes, garlic and walnuts in food processor. Whirl until smooth and creamy. With machine running, add oil in slow, steady stream through feed tube until thoroughly incorporated. Blend in lemon juice and salt.