British Beef in Guinness

Ingredients

• (45 ml) vegetable oil
  3 tbsp
• (900 g) beef stew meat cut into 1-inch (3 cm) pieces
  2 lbs
• all-purpose flour for dredging
  1 unit
• onion

  thinly sliced
  1 unit
• ribs celery

  thinly sliced
  2 unit
• carrot

  thinly sliced
  1 unit
• (500 ml) Guinness stout or other dark beer
  2 cups
• (15 ml) tomato paste
  1 tbsp
• (10 ml) sugar
  2 tsp
• (5 ml) English mustard powder
  1 tsp
• a 1x3-inch (3x8 cm) piece of orange peel
  1 unit
• salt and freshly ground pepper to taste
  1 unit