Start by releasing the pomegranate seeds. The best way to do it is to halve the pomegranate along its “belly” (you only need half a pomegranate here), then hold the half firmly in your hand with the seeds facing your palm. Over a large bowl, start bashing the back of the fruit with a wooden spoon. Don’t hit too hard or you’ll bruise the seeds and break the skin. Magically, the seeds will just fall out. Pick out any white skin that falls in.
Remove the leaves of the fennel, keeping a few for garnish later, and trim the base, making sure you leave enough of the root still attached to hold the slices together. Slice very thinly lengthwise (a mandoline would come in handy here).
In a bowl, mix the olive oil, sumac, lemon juice, tarragon, parsley, and some salt and pepper. Add the fennel and toss well. Taste for seasoning but remember, the feta will add saltiness.
Layer the fennel, then the feta, and then the pomegranate seeds in individual serving dishes. Garnish with the reserved fennel leaves, sprinkle with a bit more sumac, and serve immediately.
— By Yotam Ottolenghi and Sami Tamimi, Ottolenghi: The Cookbook