Peach and Mascarpone Parfait

Twenty minutes before you want to make the dessert, put a large bowl and electric mixer beaters in the refrigerator. When you're ready, whisk together the mascarpone, sugar and lemon juice in a medium bowl. Remove the bowl and beaters from the fridge. Pour cream into the chilled bowl and whip the cream at high speed until it holds it shape, 4 minutes. Use a spatula to gently fold the whipped cream into the mascarpone mixture. In a medium bowl, toss the peaches and amaretto together. Spoon half of the cream into 6 parfait glasses. Make a layer of the peaches, then sprinkle with the cookie crumbs. Top with the rest f the cream. Cover and chill in the fridge for up to 2 hours. Sprinkle with nuts before serving.