Taking account of your latest post the answer is blindingly obvious. Using jigsaw cut a 6mm slot about 60mm long across the cupboard door. Then use a 100mm long pan head screw through th door with penny washers each side and bolt through th fridge door, adjusting with nuts to each side of the fridge door. Cut off excess length of bolt with diamond blade in your Dremel or leave over length if you don't have one. The above in stainless steel but if you only have in ferrous paint liberally in whatever colour hammerite you have in an old tin.
This solution might not be as elegant as some suggested but it will help demonstrate to others the importance of a fully equipped and up to date workshop. Blacksmithing solutions are fine in rustic environments but the modern home demands more sophisticated tooling to provide the elegant solutions demanded!