My favorite method is to cut it in half vertically/meridianally without cutting the core nor the stem portion, crack the two sides away from the core and discard it, then flatten and slice up the sides. With care, the core is undisturbed and intact, and you can slice up the rest quickly—maybe 15-20 sec per pepper to julienned, another 15 to diced.
However, if you are looking for pretty rings, which I think are often far too large to be bite size, my* method doesn’t produce them.
(* ‘my method’ meaning as a friend/chef taught me, and is partially illustrated in Rombauer’s “Joy of Cooking”)
Following the theme of the post, perhaps the lesson is for one to look for sources outside oneself for criticism and alternatives so you can identify opportunities and metrics for improvement
“Hence our truth is the intersection of independent lies.”
-- Richard Levins, “The Strategy of Model Building in Population Biology” American Scientist, V. 54, No 4, Dec 1966, pp421-430.
It is part of this paragraph on p. 423:
“Therefore, we attempt to treat the same problem with several alternative models each with different simplifications but with a common biological assumption. Then, if these models, despite their different assumptions, lead to similar results we have what we can call a robust theorem which is relatively free of the details of the model. Hence our truth is the intersection of independent lies.”