"Vinegar reduction" refers to the process of heating and simmering vinegar to remove some of its liquid content. This results in a thicker, more concentrated vinegar with a stronger flavor. Full definition
Then, chopped pistachios, shaved red onion and a balsamic vinegar reduction complete the sweet and savory creation. (dailyburn.com)
You'll love the flavors of the sweet and tart strawberries and balsamic vinegar reduction, mixed with the mild taste of the crispy chicken. (paleocajunlady.com)
Once home, I tossed the ingredients into a bowl with a drizzle of balsamic vinegar reduction for tartness. (keepitsimplefoods.com)