Pasta Christmas Present

Name: Pasta Christmas Present
Ingredients: 1 bunch fresh parsley, large stems removed (2 1/2 to 3 lightly packed cups); 6 large eggs; 1 medium red beet (about 6 ounces), peeled and quartered; 1 pound 00 flour, plus more for dusting and kneading; Kosher salt; 8 ounces ground beef; 2 tablespoons breadcrumbs; 2 tablespoons milk; 3/4 cup grated Parmesan; 3 cloves garlic, grated; Freshly ground black pepper; 1 cup marinara sauce; One 10-ounce box frozen chopped spinach; One 8-ounce package shredded mozzarella (about 2 cups); 3 ounces penne pasta (about 1 scant cup); 1/4 cup heavy cream; Olive oil, for the pasta