Lamb Shepherd's Pie

• 2 lamb (diced)
• 2 gravy
• 1 onion (chopped)
• 1 few parsley sprigs (chopped)
• 1 paprika
• 300 gr mashed potatoes
• 130 gr peas
• 60 ml water
• 50 gr celery (diced)
• 28 gr butter