Measure the cocoa powder, raw honey, optional homemade vanilla, and sea salt into a medium glass or stainless bowl. Set a dry 1/4-cup measure, shallow dish, and scraper beside the stove.
Melt the cocoa butter in a small stainless-steel saucepan over low heat. Turn off the heat when only a few pale pieces remain and let residual warmth finish melting them. Measure exactly 1/4 cup of the clear melted cocoa butter.
Pour the measured cocoa butter into the cocoa bowl. Stir firmly with a fork for about 1 minute, scraping the bottom and sides, until uniformly dark, smooth, and glossy with no dry streaks or clear oil. Spread in one thin even layer in the prepared dish.
Freeze at least 25 minutes, until the center is rigid and does not indent. Lift out the sheet and chop it into small irregular chips and shards with a stainless-steel knife. Keep cold.