• Boil potatoes in a large pot filled with cold water and a teaspoon of salt till they are fork-tender.
• Preheat oven to 200°C.

  Using a potato ricer, mash the potatoes.
  
• Add salt and pepper to taste.
  
• Using a piping bag, pipe the potatoes onto a parchment sheet.
  
• Brush the potatoes with olive oil, and place in the preheated oven.
  
• Bake in the preheated oven, till the duchess potatoes are golden brown.
  

Soy Sauce

• Heat water in a small pan, till just warm.
  
• Add cornstarch to the water, and mix vigorously till you get a smooth thick paste.
  
• Add soy sauce, salt and pepper, and stir well. Set aside.
  
• Serve the duchess potato with soy sauce (optional) as a side dish.