HEAT medium frying pan over medium. Add hazelnuts and cook, 5 min. Transfer to a tea towel. Rub until most of skin flakes off, then coarsely chop. Return nuts to pan. Toast, stirring often, about 2 min. Add sesame seeds and continue toasting, stirring, 30 more sec.
WHISK yogurt with mascarpone and salt until smooth. Transfer to a serving bowl. Drizzle with oil. Sprinkle with nut mixture. Serve with vegetables and crackers.
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