Bring a small pan of water to a gentle boil and add the white wine vinegar. Crack the eggs one at a time into the water. While they’re cooking, toast the sourdough and place on a plate. Drizzle with olive oil, then top each slice first with the avocado salsa, then the tomato mixture. Sprinkle over the feta, coriander and crispy corn, add a squeeze of lime juice, and finish with the poached eggs.