Preheat oven to 170ºC and line a square baking tin with baking paper.
Weigh butter, golden syrup and sugar into Thermomix bowl and cook 5 min/90ºC/speed 2.
Add dry ingredients, milk & egg and mix 4-5 sec/speed 4 until flour is just combined. Don't be tempted to over mix as this will keep the cake light and fluffy.
Add pear pieces and mix 3 sec/Reverse/speed 2.
Pour cake mixture into baking tin and bake 60 minutes or until cooked (test with a wooden skewer, it is ready when it comes out clean).
Cool in tin for 10 minutes, then cool on a wire rack until cold.
Tastes even better the next day (if you can resist!)
For a richer flavour, use 70g golden syrup and 70g of treacle.