Pork And Summer Vegetables Mediterranean Style

• 1/2 one lemons juice
• 750 gr green beans in
• 575 gr potatoes-cubed (new)
• 260 gr pork cubed (lean)
• 60 gr feta cheese for topping
• 60 ml stock
• 5 gr oregano
• 1 gr salt
• 1 gr black pepper (freshly ground)