Smashed Potato–Chorizo Hash

Name: Smashed Potato–Chorizo Hash
Ingredients: 1/4 cup apple cider vinegar; 1 teaspoon sugar; 1/2 small red onion, thinly sliced; 1 1/2 pounds baby red potatoes; Kosher salt; 8 ounces shishito peppers, stemmed and halved crosswise; 8 ounces thin asparagus, trimmed and cut into 1 1/2-inch pieces; 1/4 cup extra-virgin olive oil; Freshly ground pepper; 1/2 teaspoon smoked paprika, plus more for topping; 2 to 3 links fresh chorizo (about 9 ounces total), casings removed; 4 large eggs; 1/2 cup fresh parsley, chopped