Preheat the oven to 200C/180C Fan. Line a baking sheet with kitchen paper and set aside.
Pour the oil into a large roasting tin and pop in the oven for about 5 minutes - or until it is very hot (like you would if you were making roast potatoes).
Tip the sausages into the hot oil and spread in an even layer. Pop in the oven and roast for about 20-25 minutes - or until golden brown. Give the roasting tin a good shake at the halfway mark to turn them over.
Using a slotted spoon, remove the sausages from the tin and place onto the baking sheet lined with kitchen paper. This will help remove any excess oil.
Carefully discard any oil remaining in the tin. I use kitchen paper to wipe the oil out as there shouldn’t be loads left but if there is, just tip it carefully into a heatproof bowl and discard once cool.
Meanwhile, in a small bowl, mix together the hoisin sauce, sesame oil, honey and soy sauce.
Return the sausages to the tin and pour over the hoisin-honey mixture. Stir well until all of the sausages are evenly coated.
Return the sausages to the oven and roast for a further 5 minutes, shaking the tin halfway through, or until the sausages are a deep golden brown and sticky. Watch closely to ensure they don’t burn!
Meanwhile make the dipping sauce: mix together the tomato ketchup, runny honey, soy sauce and wholegrain mustard in a small bowl. Taste and adjust the flavours accordingly. Set aside.
Remove the sticky glazed sausages from the oven and tip onto a serving plate. Sprinkle with sesame seeds. Serve straight away with the dipping sauce.