Sirloin Steaks with Port Sauce

Ingredients

• 500 g small new potatoes, washed and any larger ones halved
• 1 tablespoon extra virgin olive oil
• 250 g large mushrooms, quartered
• 250 g sugar snap peas
• 1 large red pepper, seeded and cut into thin strips
• 3⁄4 cup reduced-salt beef or vegetable stock
• 1 tablespoon Worcestershire sauce
• 1 teaspoon Dijon mustard
• 1⁄2 teaspoon dark brown sugar
• 4 thin sirloin steaks, about 150 g each, trimmed of visible fat
• pepper to taste
• 1 1⁄2 tablespoons reduced-salt margarine
• 1 shallot, finely chopped
• 2 garlic cloves, crushed
• 5 tablespoons port