French Macarons

Reputedly difficult to make - but try my version of French Macarons and you'll find they're not only easier than you think, but they're actually scrummy sandwiches of sheer joy! Here's what you'll need:

• 200g Icing Sugar
  
• 110g Ground Almonds 
  
• 45g Caster Sugar
  
• 3 Egg Whites
  
• 1/4 tsp Cream of Tartar
  
• Pinch of Salt 
  
• Food colouring (optional)