Luigi's Lasagna Al Forno

• 1 container
• 1/2 onion
• 475 ml milk
• 220 gr ricotta cheese
• 120 ml wine for the bechamel (red)
• 80 gr lasagna noodles
• 70 gr mozzarella
• 60 ml olive oil
• 34 gr butter (unsalted)
• 32 gr all purpose flour