Caramelized Onion Frittata without olive tenders

1 cup diced baking potato 3 tablespoons water 1 lb onion , sliced 1/3 cup water 1 tablespoon chopped fresh sage 1/2 teaspoon salt 1/4 teaspoon black pepper[...]

1 large onion , sliced 4 tablespoons extra virgin olive oil 1 teaspoon caster sugar 4 eggs 3 tablespoons freshly grated parmesan cheese 1 teaspoon fresh thyme[...]

1 tablespoon butter 1 tablespoon oil 3 onions , sliced 8 eggs 3/4 cup cream (or milk) black pepper 1/2 cup cheddar cheese , grated (aged) 1 tablespoon thyme[...]