Preheat the oven to 400 degrees F. Place the garlic on a piece of foil, drizzle with olive oil and wrap up. Bake until tender, about 30 minutes. Let cool slightly, then squeeze the garlic from its skin.
Combine 2 teaspoons water, the roasted garlic, lemon juice, sugar, 1 teaspoon salt, and pepper to taste in a blender or mini food processor. With the motor running, slowly pour in 1/4 cup each olive and grapeseed oils through the feed tube, blending until emulsified.
Toss the apples, cabbage, walnuts, parsley and truffle oil in a medium bowl. Add the dressing and toss; season with salt and pepper. Refrigerate the slaw until chilled, about 45 minutes.
Photograph by Andrew Mccaul
Recipe courtesy of Jose Garces for Food Network Magazine