It's all about the cooking of the bacon
Seriously... don't trim the fat; you'll never know when it's properly cooked (if you must trim it; do it after you've cooked it) - buy proper dry cured (or correctly brined) bacon; fry it gently in a good glug of rapeseed oil until the fat has rendered down and become crunchy and liberally fill two slices of fresh; hand cut bread.