Crunchy-skinny-sexy Waldorf

As I was making my Shepherd's pie for our book club supper last night, I started to nibble thoughtfully on a celery stick and realized with quite an epiphany what a maligned and ignored vegetable the poor celery is. All due credit to Hugh Fearnley-Whittingstall who said, famously, "Celery is a bit like a gym membership." The crunch is the thing, isn't it? It's the minxy little crunch that gets you every time. Which led (as it does, stay with me here) to my driving home this morning down the CA 170 (my very favorite freeway) absolutely ravenous after schooling three horses and wondering what could prevent me from stopping at a fast food drive-thru. Cut to twenty minutes later and a plate adorned with a skinny version of a Waldorf salad sits in front of me, proud as can be (see photo below). Easy and inadvertently calorie-conscious (as I couldn't find any mayo in the bloody fridge); here's how you make this excruciatingly simple, scrumptious, crunchy lunch:

2-3 sticks of celery, chopped
1 green apple (or any kind of apple; I had green), chopped
handful of walnuts, chopped
bit of cold chicken, chopped
glug of olive oil
big spoonful of greek yogurt
salt & pepper

Combine ingredients & serve.