Biscotti D'amaretti

• 3 eggs
• 1 egg (white)
• 400 gr all purpose flour
• 200 gr sugar
• 110 gr butter
• 60 gr almonds (finely chopped)
• 12 gr baking powder
• 4 gr lemon peel (finely shredded)
• 1 gr almond extract
• 1 gr saffron if desired