Step 1

Heat a medium size skillet to medium high heat.

Step 2

Add butter and onions to pan.

Step 3

Saute until onions are translucent, about 5-6 minutes. Add in salt and pepper.

Step 4

Stir and continue to saute, stirring throughout for another 10 minutes. (the liquid will start to leave and onions will slightly brown, be sure they don’t burn or blacken)

Step 5

Add balsamic vinegar to onions, stir and saute for another 2-3 minutes until vinegar has soaked into onions.

Step 6

Remove from heat. Store in air tight container for up to one week.