Catalan Kale, Potato, and Garlic Soup

Yield:	6 Servings
Categories:	European, Vegetables, Soups

16	lg	Cloves garlic, peeled
3	tb	Unsalted Butter
2	ts	Olive oil
1	lg	Spanish onion, peeled and finely minced
6	c	(or 8) chicken stock
1 1/2	lb	Kale, stemmed, washed, and torn into 1-inch pieces
2	md	All-purpose potatoes, peeled and finely diced
		Salt and freshly ground white pepper
1/2	c	Heavy cream, optional