Rasa's Truffle Gnudi

Ingredients

• 2 kg ricotta
• 1 whole egg
• 1 egg yolk
• 250g Grana Padano, grated
• 1/3 cup parsley, chopped
• 100g truffle paste
• 2 cups all-purpose flour
• 2 bunches parsley, roughly chopped
• 1 garlic clove, finely chopped
• 1 lemon
• 100g walnuts, toasted
• 150g Grana Padano
• 1 1/2 cups extra virgin olive oil
• Salt, to taste
• 2 cups Grana Padano, grated
• 1 1/2 cups white wine vinegar
• 1/2 cup water
• 1/2 cup sugar
• Pinch of salt
• 1 clamshell Shimeji mushrooms
• Mushrooms, your choice
• Arugula
• Butter