Greens Sauteed with Garlic and Oil

This is another recipe I got from the off-site meeting.  When I want a change to my spinach or chard, I usually make this.

3 Tbsp olive oil
1 large onion, minced
2 garlic cloves, minced
1 lb spinach, Tuscan kale, Swiss chard, or other dark leafy green, washed, stemmed, chopped, blanched and shocked
Salt and Pepper
Balsamic Vinegar
Brown Sugar

Heat the olive oil in a large skillet over medium-high heat.  Add the onion and cook until carmalized, seasoning to taste with salt and pepper.  Add the garlic and cook until aromatic.

Add the greens, in bunched, to the pan, tossing with tongs, and wilting the greens.  Continue to cook until the greens are very tender.  Adjust the seasonings to taste with kosher salt, pepper, balsamic vinegar and sugar.  Serve immediately.