Potato Salad with Yogurt

Potato Salad with Yogurt (Patatosalata me Giaourti) 

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4 Glasses of potatoes peeled (½pt glass)
2-3 garlic cloves crushed
1 glass picked gerkins finly chopped
2 tablespoons drained capers
parsley finely chopped
1 tablespoon lemon juice
1.5 glasses 0% greek yogurt
1 lemon slice

Boil the potatoes with the lemon slice, drain and leave aside to cool then cut into cubes.   Combine potatoes and all the remaining ingredients, mix well and chill.