Mascarpone, Speck, and Arugula Pizza

Dollops of rich mascarpone cheese serve as the sauce for this pizza that layers creamy, salty, and peppery flavors. A specialty of northeastern Italy, speck is a lightly smoked, salt-cured ham. If unavailable, prosciutto, which has a milder flavor, can be substituted. Upgrade this pizza with a scattering of bite-size pieces of roasted winter squash, adding them with the mascarpone.