Caramelize your onions: Melt butter in a saucepan or deep skillet over medium heat until sizzling. Add onions and cook until translucent, about 1 minute. Add a healthy pinch of sea salt and black pepper to the onions, stir to combine, reduce heat to medium low then cook the onions for 20-25 minutes (stirring occasionally) until they turn brown and start to crisp up on the edges. Remove from heat and set aside.
While the onions are caramelizing, place one prosciutto rectangle in each cup of a mini cupcake tin. Bake at 375F for 10-15 minutes or until the fat turns golden and the prosciutto is crispy. Using a fork, remove prosciutto cups from the mini cupcake tin and transfer them to a paper towel to absorb excess grease.
In a small bowl, combine diced pear and lemon juice then stir to combine.
Great tutorial for how to caramelize onions properly here!