Pork Katsu Sando (Japanese Pork Sandwich)

2 pork cutlets (about 200g)

100g cabbage, finely shredded

4 slices thick white bread

Butter, as needed

Whole grain mustard, as needed

All-purpose flour, as needed

Eggs, as needed

Breadcrumbs, as needed

Dashi Chuno Sauce, as needed

Salt, to taste

Ground black pepper, to taste

Vegetable oil, as needed