Method:
Brown garlic in a dry skillet over medium heat, shaking skillet from time to time until garlic is just lightly brown in places, about 10 minutes. Remove garlic, cool and remove skins.
Toast nuts in pan over medium heat, shaking the pan to prevent burning, until lightly brown. Combine arugula, parsley, garlic, walnuts and olive oil in a food processor.
Blend until smooth. Drizzle in more olive oil if needed to obtain desired consistency. Place in serving bowl and stir in ricotta and Parmigiano-Reggiano. Season with salt and pepper.