This spicy green is one of my favorites to toss on a salad, and I was craving something warm, so I decided to try sauteeing it in a healthy way--no oil! In just a couple minutes, I had a great warm topping to cover my lettuce and serve with other toppings. **Note: I am updating the recipe, as I think it deserves higher than the two stars it has gotten :( I have problems with onions (or my stomach thinks it does!), so I don't use them, but for those of you out there who want onions in the arugula, go for it! Here's a revised version of how to make the arugula, a bit more calorie-rich, but I'm sure many will find the taste improved. (Just for the record, I still like the greens without the onion and oil added, but I'm used to a blander diet.) Additional note: the original recipe, without the oil, onions and garlic, was 11 calories; I wouldn't worry about the onions and garlic, but you could definitely leave out the oil if you didn't want to add those extra calories.