Pepper Steak with Leek Mashed Potatoes

Ingredients

• 2 tbsp mixed or black peppercorns (coarsely crushed)
• 4 beef tenderloin steaks (2 cm thick, about 150 g each, trimmed of fat)
• 1 tsp extra virgin olive oil
• parsley (chopped, or snipped fresh chives, to garnish)
• 900 g potatoes (peeled and cut into chunks)
• 2 tsp extra virgin olive oil
• 200 g leeks ( finely chopped)
• 1/2 cup low-fat milk
• 1 tbsp whole-grain mustard
• 1 1/2 tbsp reduced-salt margarine
• pepper (to taste)