3 1/2 cups heavy cream
3 tbsp. grated Parmesan cheese
2 cloves garlic, minced
2 tbsp. onion or shallot, minced
3 tbsp. butter, unsalted
1/2 tsp. each salt and pepper

Melt butter in a saucepan and saute onion or shallot over medium heat until translucent, reduce heat and add garlic, saute one minute.

Add remaining ingredients, cover, and simmer over low heat for 20 to 30 minutes.