This recipe might help.

Bertucci's Nolio Pizza

1 medium yellow onion
1 tsp white pepper
1 cup heavy cream
1/2 lemon
1 - 1 1/2 cup shredded prosciutto
1 1/2 cup shredded mozzarella cheese
1 package Pilsbury pizza dough (or home made).
Olive oil.

Preheat oven to 400 F. Boil heavy cream until thickened. Add white pepper and the juice from
a half of a lemon. Slice onion very thin so that you are left with rings. Saute onion rings in olive oil until they are starting to get
brown.

Assemble pizza as follows: Unroll pizza dough onto a non-stick pizza pan. Add cheese, then prosciutto. (I like to add some pepperoni slices too). Add the cream mixture at a time to the pizza, a tablespoon at a time, forming little
puddles spread around the pizza. Drain the onions and put them on last. They will continue to carmelize as the pizza bakes. Bake 8-10 minutes. Don't over bake. You don't want to "dry out" the pizza.