Risotto Alla Parmigiana

Yield:	10 Servings
Categories:	Italian, Rice

2	tb	Unsalted butter
2	tb	Olive oil
1	md	Onion; finely chopped
1	lb	Arborio rice
6	c	Chicken stock; hot
2	tb	Butter
3	oz	Parmagiano Reggiano cheese; coarsely grated