A simple salad I make all the time
First mince up your onion and place in a large bowl. Pour a good amount of balsamic vinegar into the bowl and smash the onion into the liquid with the back of a spoon. Sprinkle some salt into your mixture.
With a sharp knife slice your spinach into very thin strips, and do the same with your basil. Add them both into the bowl with the dressing and toss. The longer the leaves sit, the more the vinegar will break them down making them become melt-in-your mouth soft. Add fresh berries and toasted nuts of any kind to make the salad even brighter.