Wash the potatoes thoroughly. Cook in boiling water for about 25 minutes. Boil eggs in boiling water for 10 minutes until hard. Clean, wash and cut tomatoes into small pieces. Peel and finely chop the onions.
Rinse eggs cold, peel and dice. Mix tomatoes, eggs, onions, vinegar and oil. Season to taste with salt, pepper and sugar. Peel garlic and cut into pieces. Puree garlic, feta cheese and sour cream.
Wash the basil, chop roughly and stir into the cream. Season to taste with salt and pepper. Drain potatoes, rinse and peel. Serve potatoes and dips together.