I would just do a large bowl of lamb's lettuce with a sauce based on walnut oil and add chopped walnuts - also pomegranate seeds (or whatever the bits are called that come out of the pomegranate) can be thrown in. Guests can eat as much or as little as they like.
However, you say "no faff". Lamb's lettuce is usually just washed and served in little bundles, as it grows (no faff), but I will spend 10-15 minutes cutting the roots off. I am always scared that a grain of sand or earth will be caught at the bottom where all the stalks come together and I've broken more than one tooth by biting on grains of sand!
Melba toast or tiny rolls to go with the salad.