For the sauce, add cornflour, water, sweet chilli sauce, soy sauce and honey to a bowl and mix well. Add lemon juice and lemon zest. Heat pan and add sesame oil, garlic, ginger and chilli. Stir fry for 1-2 mins then add onions and carrots and then the honey chilli sauce for another 1-2 mins. If sauce thickens too much, add a little water to the pan.