Kokoretsi Tis Souvlas

• 500 lamb hearts
• 3 1/2 lemons
• 3 bay leaves in
• 2 lamb kidneys
• 1 1/2 lemon
• 1 onion (grated)
• 1 black pepper sausage casings (freshly ground)
• 250 gr lamb sweetbreads
• 120 ml olive oil
• 3 gr parsley (chopped)