https://en.wikipedia.org/wiki/Micromort?wprov=sfla1
I'm unable to find micromort numbers for food-poisoning or food preservation techniques, but my wild guess is that leaving an average vegetarian leftover overnight at an average kitchen temperature on the averagely cleaned kitchen counter, unrefrigerated and even not covered at all, then eating it the next day (maybe reheated) is gonna be negligible amounts of risk compared to many many many other risks people take everyday without blinking their eye about it (such as walking, driving, climbing stairs, swimming, drinking alcohol, using cleaning products, inhaling/eating environmental pollution, not washing hands after toilet, ...)
The melting pot of flavours is there in NL, just not so much in a place like Nijmegen. Go to Den Haag, Rotterdam, Amsterdam and you'll find whatever you want.