Weird food habits! I eat fairly strange sandwiches, one of my faves is bread and butter with cheddar cheese biscuits and burger mustard! do tell yours?!
BTW it can be any type of food, not just sandwiches. I have papal who eats cornflakes with salad cream on, as an example! 
Fini_Mayo
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Taiwanese style hamburger: grounded peanut powder, sweet soya roasted pork slice, preserved vegetables. Yum 
sharp cheddar on toast with sweet pickle relish and mayo
white rice with ketchup and dehydrated onions.
makes a note to try that