The Problem
In my "How to handle dates in 11ty" article I wanted to show some of my 11ty code in Markdown, but it tried to compile things like {{content}} and actually put content in there.
Solution Summary
Wrap your code in the raw tag. See Liquid Docs.
Explanation
Eleventy's default markdownTemplateEngine is Liquid, and Liquid has a tag you can use called raw that "outputs any Liquid code as text instead of rendering it."
Ironically you can't wrap a raw tag in another raw tag so the only way for me to show the full code was to use a Github Gist: