How to grow it:
It might come in bags at the supermarket, but there's nothing easier than growing these salad leaves yourself.
A packet of mesclun salad seed is about the cost of one bag of cut leaves.
If you have it growing fresh in the garden or in a pot on the deck, you don't have to deal with slimy, stinky salad greens past their best in the fridge.
All you need is a sunny spot, with fine, crumbly soil (a little added compost helps).