Ingredients

• 5 tablespoons extra virgin olive oil, divided usage
  
• 3 tablespoons butter, divided usage
  
• 1 pound fingerling potatoes, scrubbed and patted dry
  
• 1 large leek, white and light green parts only, sliced into rings
  
• ¹/₂ cup white wine
  
• 1 small onion, diced
  
• 2 tablespoons finely milled flour (instant flour)
  
• 3 strips uncooked bacon, cut into small pieces
  
• 3 cups vegetable stock
  
• 1 cup half and half (full or reduced fat)
  
• 1 splash sherry
  
• 1 splash fish sauce
  
• ¹/₂ cup Gruyere cheese, grated
  
• 1 tablespoon flat-leaf parsley, minced