A few weeks ago I popped down to Palm Desert, California, to get a little relief from the Seattle dreariness—sort of a must-do thing in February or March if you live ’round these parts. The PNW is a beautiful area, and has all that rain to thank for its lush, green landscapes, but if you don’t escape for a bit in mid-winter, you start to go a little nuts. Must. Get. Vitamin D. NOW. Anyway, I had the best cobb salad out for lunch one day, and the not-so-secret ingredient—it was right there on the menu—was horseradish. It was added to the dressing, and gave the salad a fantastic zip. I’ve whipped up a vegan version for this recipe that comes pretty close to what I remember tasting. Heirloom tomatoes were looking pretty good at the grocery store when I was shopping for ingredients, so I grabbed a couple of those to toss with the romaine, then topped it off with a hard-boiled egg and chopped avocado. Now, I just need a patio and some …