Crema de Calabacín, Puerro y Pera con Roquefort
zucchini (about 12 oz/350 g) • leeks (about 9 oz/250 g) • pears (about 7 oz/200 g) • (about 1 oz/30 g) butter • heavy cream (about 100 ml) • (about 1 1/2 oz/40 g) Roquefort cheese • bouillon cube • Water, enough to cover the vegetables • Salt, to taste • Black pepper, to taste • nutmeg • prosciutto