The most Ketogenic thing you can eat is…wait for it…nothing.
What that means is intermittent fasting.
When you’re already in Ketosis, and you stop eating for a couple days, you burn nothing but body fat because that is all that there is, and your insulin is low enough to access it.
This is a great way to start Keto, but you will have to power through the hunger that comes from being a carb burner.
If you are already in Ketosis, you can just stop eating, and you won’t really notice (too much).