Step 1

In a small bowl mix together the cornstarch and water. Set aside.

Step 2

In a small saucepan heat the oil over medium heat and whisk in the tomato paste. Cook on low for 3-4 minutes.

Step 3

Add the sugar, vinegar and soy sauce. Whisk to combine and cook another 3 minutes.

Step 4

Stir the cornstarch slurry and slowly whisk into the saucepan. Cook for another 2-3 minutes and sauce has thickened (See Note 1). Add a tablespoon of water if a thinner sauce is preferred. Season to taste with more or less vinegar for a tarter flavored sauce or add a tablespoon of sugar for a sweeter.