Sweet Potato and Mushroom Kreplach

Name: Sweet Potato and Mushroom Kreplach
Prep time: 1 h
Cook time: 1 h 10 min
Total time: 2 h 10 min
Cuisine: Eastern European
Ingredients: 8 ounce sweet potato (1 large); 2 tablespoons extra virgin olive oil (plus extra for the sweet potato); 1/2 cup/4 ounces onion (finely chopped); 8 ounces crimini mushrooms (or assorted wild or portobello mushrooms, finely chopped); Pinch sea salt; Black pepper (to taste, freshly ground); 1 3/4 cups all-purpose flour (plus extra as needed); 1/2 teaspoon fine sea salt (or kosher salt); 3 large eggs; 2 tablespoons extra virgin olive oil (or neutral-flavored oil); 1 tablespoon water