Perhaps it’s a proprietary manufacturing technique, or the fact that you add a little chickpea flour to your dosa batter.
Professionals often develop secret approaches and recipes that they use in their work.
It doesn’t matter. Even famous ones.
If it really matters to your competition, they’re going to figure it out.
And if they figure it out, you’ll succeed based on all the things that aren’t a secret–your care, effort and empathy. Time spent securing the secret in a vault is time wasted.