Mix minced beef, water chestnut, shitake mushroom, shallots, garlic, onion, leek, ginger paste & black pepper together.
Oil the lasagna dish first. Wet the wonton wrapper with chicken stock then put it in the bottom of the dish until fully covered.
Spread the beef mixture on top about ½ cm thick then top with mozzarella cheese.
Repeat the process and top it generously with mozzarella cheese.
Pour a little bit of chicken stock and steam for 10-15 minutes until the mozzarella cheese has melted.
When it is done, top it off with thinly sliced leek, toasted sesame seeds and chilli flakes. Enjoy while it is hot.