Heat the olive oil in a large skillet over medium-high heat.
Add the ground lamb and cook until browned, breaking it up with a wooden spoon or spatula.
Stir in the diced onion, carrot, and celery, cooking for 5 minutes until the vegetables have softened.
Add the minced garlic, tomato paste, dried rosemary, sea salt, and black pepper, stirring for 1 minute to bloom the spices.
Pour in the beef broth and reduce heat to low, simmering for 15 minutes until the sauce has thickened and the flavors are concentrated.
While the ragu simmers, bring 1 cup of water to a boil in a separate small pot and whisk in the dry polenta.
Reduce polenta heat to low and cook for 5 minutes, then vigorously whisk in the liquid egg whites for 2 minutes until the texture is fluffy and creamy.
Spoon the creamy polenta into a shallow bowl and top with the savory lamb ragu to serve.