To make the tofu - slice it into cubes, then place in a bowl or tub and toss with the cornflour and salt. Heat a frying pan with a generous glug of oil over a medium-high heat and add the tofu. Fry until crispy and golden brown.
In a bowl, stir together all of the sauce ingredients.
Add back to the pan and cook until thickened (keep stirring for 1-2 minutes). Add in the tofu and stir so all the pieces are coated with the sticky sauce. Serve with spring onions and sesame seeds and enjoy!