The sweetness of the oven-blasted pumpkin, together with the salty intensity of the feta, the bitterness of the radicchio and the sour, subtle heat of the red onion, is a model of harmonious simplicity.
Add peanut oil and pumpkinseed oil to onion mixture, and mix well. In a large bowl, combine pumpkin, feta, radicchio, onion mixture and half the pine nuts. Mix everything gently by hand, and turn out onto a large plate or wide shallow bowl. Garnish with remaining pine nuts, and serve.