3 potato leek no cream Recipes

potato, peeled and chopped into 2 inch chunks, leek, trimmed and all the white part and some of the green sliced into 2 inch slices, onion , chunked, butter, water, vegetable stock (cube will do) or 3/4 pint chicken stock (cube will do), salt and pepper, fresh chives or 1 bunch dried chives, would do, for garnish