New York Hot Dog Cart Onion Sauce - cooking recipe

Ingredients

2 teaspoons vegetable oil
2 medium onions, sliced very thinly
1/4 cup ketchup
1 cup water
1/8 teaspoon salt
1/8 teaspoon cinnamon

Preparation

In a small sauce pan place vegetable oil, and onions.
Cook over medium heat; saute until onion is soft; don't burn it.
Quickly add ketchup, water, stir.
Stir for at least 20 minutes or until the water is reduced about 1/2.
Note: I had to mention a measurement in order for this recipe to go through. The truth is to use a pinch of cinnamon and a pinch of salt.
This is the true recipe for Onion Sauce for New York Hot dogs.
When I use the sauerkraut I boil it with added water to make it softer.