Cucumber soup with lemongrass and spinach

Ingredients

• unsalted butter
  2 tbsp
• ribs celery

  strings removed
  2 unit
• - with a vegetable peeler
  1 unit
• - chopped
  1 unit
• Onion

  minced
  1 small
• fresh lemongrass
  2 stalks
• - tender inside only

  minced
  1 unit
• med cucumbers

  peeled, seeded
  2 unit
• - chopped
  1 unit
• chicken stock or broth
  2 cup
• spinach leaves
  1 1/2 cup
• fresh cilantro leaves
  1/4 cup
• whipping cream

  if desired
  3 tbsp
• salt

  pepper to taste
  1 unit