Beef Tajine With Prunes

• 3 onions (chopped)
• 1 alcatra
• 1 garlic clove (minced)
• 1 salt and pepper
• 1/2 pitted prunes
• 1,400 gr beef cubed
• 30 ml oil
• 24 gr sesame seeds
• 16 gr ginger (grated)
• 14 gr butter