"When I was a kid, I remember one particular pizza reataurant that used pepperoni that was about the same diameter as a quarter. These little pepperonis would cup when cooked and the rim/edge of the pepperoni would burn ever so slightly. It was the best tasting pepperoni that I can remember."
You could also be describing "Swifts Premium Pepperoni" It was about that size and it was a dark red, spicier than most and it cupped when it cooked because of the natural casing it was made in would shrink when cooked. And yes the edges would get dark and crispy. Still my favorite by far.
Ezzo Supreme Special
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