Place the pumpkin, onion, garlic (minus skins), cumin, coriander, paprika, 2 tablespoons of olive oil, lemon juice, zest, coconut flour, tahini, 1/2 of the finely chopped coriander and pinch of salt and pepper in a food processor like a Magimix. Blitz until almost smooth. You might need to scrape the sides with a spatula and blitz a few times. Empty the mix into a bowl and fold in the remaining chopped coriander.