Sauté onions and garlic in the warm butter. Add pumpkin, continue to steam for about 2 min. Add long-grain rice, sauté, stirring, until translucent. Add wine, cook completely. Gradually add soup, stirring frequently, so that long-grain rice is just covered with liquid.
Simmer until long-grain rice is creamy and al dente (about 20 min).
Stir in the Gorgonzola, season, garnish.