Mardi Gras teaches the secrets of making New Orleans style oyster & artichoke soup in simple steps. First chop 1 onion, 1 garlic clove and a can of artichoke coarsely and grind another can of artichoke in a processor. Melt butter in a soup pot, add the chopped onion and garlic to it. Now add some salt, pepper, seasoning and a quarter cup of flour and cook by stirring constantly. Add the quartered artichoke, half and half (half milk and half cream) and artichoke puree and cook for 10 minutes. Now add the oysters and a quarter cup of cheese to it and cook for 7 minutes. Finally garnish it with green onions and serve hot in a bowl.