With the help of a small blender or food processor, this recipe yields a rich walnut-feta dressing, ideal for drizzling over a mix of seasoned tomatoes, chickpeas and avocados. The dressing can be made without electricity by mashing the feta and mincing the walnuts, cilantro and garlic, but if you have an appliance on hand, don’t miss out on the luscious quality of the blade-blended dressing. A word of warning: the success of this salad lives and dies by the freshness of the walnuts. Rancid walnuts will generate a rancid dressing. Before blending, smell your walnuts to make sure there are no off notes — you want the aromas to be neutral or nutty. If time and patience allow, quickly toast the nuts as outlined in the tip below.