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Heat the oil in a non-stick frying pan over a medium heat. Add the onion, sprinkle over the sugar and cook for about 10 minutes or until the onion has softened and caramelised. Set aside and leave to cool. Clean the pan and pop it back over a low–medium heat.
Butter one side of both pieces of bread. Layer the cheddar, mozzarella, haggis and caramelised red onions on one of the unbuttered sides of sourdough, then top with other slice, unbuttered side facing in. Pop the sandwich into the pan carefully and fry on both sides until the outside is golden brown and the inside is gooey and melted.
Cut in half and enjoy with some brown sauce.