Sauté pancetta until crisp. Remove from pan.
Deglaze pan and add leeks. Cook until slightly tender.
Add cream, salt, and pepper to taste (slightly more saltthan you think you need). Bring to boil and reduce heat.Simmer for 5 minutes.
In a mixing bowl, combine potatoes, pancetta, raisins,sage, and cream mixture. Mix well, coating all thepotatoes.
Neatly layer potatoes in a baking dish and pour anyremaining liquid/mix over the top.
Top with gruyere and tent with parchment and foil.Place in oven at 350 for 1 hour or until potatoes aretender. Remove tent and brown top for another 10-15minutes.
Enjoy!