1 1/2 cups balsamic vinegar
1/4 cup of brown sugar
Bring vinegar to a boil, turn down the heat and let it simmer.
When it reduces halfway, add brown sugar.
Simmer some more until it becomes syrupy and sticks to the back of a wooden spoon. As it cools it will thicken up. Store leftovers in refrigerator.
Drizzle over steak or brush onto chicken in the last five minutes of baking.