Sirloin Steaks with Port Sauce

Ingredients

• 1 lb new potatoes (large ones halved)
• 1 tsp olive oil
• 1 cup large mushrooms (quartered)
• 1 cup sugar snap or snow peas
• 1 large red pepper (seeded and cut into thin strips)
• 2/3 cup low-sodium beef or vegetable stock (divided)
• 1 tbsp Worcestershire sauce
• 1 tsp Dijon mustard
• 1 tsp brown sugar
• 4 5 oz thin sirloin steaks (fat trimmed)
• Salt and pepper (to taste)
• 1 tsp butter
• 1 shallot (finely chopped)
• 2 garlic cloves (crushed)
• 4 tbsp port