Meanwhile, bring quinoa and 3 cups water to a boil in a medium saucepan. Cover, reduce heat to low, and simmer until quinoa is cooked, about 10 minutes. Drain; return to pan. Cover; let sit for 15 minutes. Fluff with a fork; transfer to a large bowl.
Using a small sharp knife, cut all peel and white pith from lemon. Cut between membranes to release segments; discard membranes and roughly chop. Add lemon with any juices and remaining 1 Tbsp. oil to quinoa; stir. Add fennel mixture, chile, and herbs. Toss gently to incorporate. Season with salt and pepper. Transfer salad to a platter; sprinkle with pomegranate seeds.
Recipe by Yotam Ottolenghi & Photograph by Jonathan Lovekin