Roasted Potatoes with water

1 1/2 lbs potatoes , small and firm 2 tablespoons butter 2 tablespoons olive oil 2 red onions , cut into chunks 8 cloves garlic , unpeeled 2 tablespoons fresh[...]

1 pound potatoes fingerling or red new potatoes, washed 1 tablespoon olive oil 1 each yellow onion halved and thinly sliced 2 cloves garlic or to taste,[...]