Thinly slice 2 medium yellow onions
Add 1 tablespoon of extra virgin olive oil into a large skillet and place over medium heat
Add the thinly sliced onions, 2 teaspoons of granulated sugar and a generous pinch of salt and black pepper and stir to combine
Cook the onions, uncovered, until they begin to soften and develop light golden color (about 5-7 minutes)
Add a splash of stock and stir to combine
Once the stock has been absorbed, add another splash of stock and cook until that stock has been absorbed
Repeat the process every few minutes until 1/2-3/4 cup of stock has been absorbed and the onions are golden brown, soft and caramelized
Optionally, add a tablespoon of balsamic vinegar into the skillet, stir to combine and cook for another minute or so.
Use immediately