Preheat the oven to 350°. Spread the hazelnuts in a pie plate and bake for about 12 minutes, or until the nuts are fragrant and the skins blister. Let cool, then transfer the nuts to a kitchen towel and rub to remove the skins. Transfer the nuts to a food processor and pulse until finely ground. Transfer the nuts to a bowl and wipe out the food processor.
In the food processor, combine the ricotta, goat cheese, mustard and truffle oil and process until smooth and creamy, scraping down the sides of the bowl. Transfer the dip to a serving bowl and stir in the hazelnuts. Season with salt and white pepper, add a little more truffle oil, if needed, and serve.
Make Ahead: The dip can be refrigerated overnight.
Serve With: Pear and apple slices, garlic or black pepper crackers, flatbreads and grissini.
Wine Recommendation: Stuckey: The lively 1997 Robert Sinskey Aries Pinot Blanc from Napa has a lemony acidity that stands up to the creamy cheeses; the judicious amount of nutty French oak echoes the hazelnuts.Triffon: The spread's hazelnut and truffle flavors call for richness, in the form of the yeasty, mouth-filling Nonvintage Bollinger Special Cuvée Brut Champagne.