At this time of year two things are certain: Your body and your wallet are not in the shape they ought to be. That's why you should cook your guests some heart-warming Spanish style garlic soup...
It's hard to find a dish that is easier to cook. And still your guests will be thoroughly impressed and all warm inside when you serve it (yes, it's true).
You will find an excellent recipe for classic Castilian (in the heart of Spain) "sopa de ajo" here:
