It depends on the brand of sandwich maker. I had one many years ago, on which I would crack an egg onto the bottom slice of bread, place some mushrooms on top, then seal with the other slice of bread, the result was awesome, or so it seemed at the time, yolk runny, mushrooms cooked, what a delight. Thinking back sandwich makers were new on the market at the time, and so was I, new to living alone, new to college, and certainly new to cooking. One other thought, are toasted sandwich makers unique to the British Isles?
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You tried your best and failed miserably, the lesson is, never try. Homer J. Simpson