KIMCHI POTATO HASH

800g king edward or maris piper potatoes, cut into 2cm cubes • 2 tbsp fine sea salt • 4 tbsp olive oil • 2 x 77g packs diced pancetta • ½ Chinese leaf lettuce, roughly chopped (about 300g) • 20g unsalted butter • 2 tbsp kimchi paste • 4 eggs • 4 salad onions, finely chopped • ¼ x 28g pack fresh coriander, leaves roughly chopped