To make the pickled radish, In a jar or bowl with a lid, add the radishes, lime or vinegar, water, and salt and mix to combine. Submerge as many radishes as you can into the liquid. This is best after it sits in the fridge overnight, but can also be used after 10 minutes.
Add peas to boiling water and simmer for 2 minutes, then drain and rinse with cold water to cool them down.
In a high-speed blender, add all but ¼ cup of the peas (save some for topping), oil, lemon, tahini, and salt. Blend until smooth or keep it slightly chunky, scraping down the sides as needed.
Spread it onto your toast and top with pickled radish, reserved peas, herbs, flaky salt, and pepper.