Separate the radish bulbs from the stems. Clean both of them very well, I recommend using a salad spinner for this!
Finely slice the radishes into half-moon pieces. Chop the radish stems into bite-sized greens. Set both to the side.
In a large bowl, add the yogurt, lemon zest, lemon juice, honey, olive oil, minced garlic and dill. Mix and add a pinch each of salt, black pepper and red pepper flakes. Season and adjust the salt, pepper and red pepper to your preference.
Add the radish slices and the radish greens directly into the bowl with the dressing. Use clean hands to give it a nice toss to fully coat the greens in the dressing.
Lightly toast the bread slices, and add a generous smear of avocado to each.
To plate, take a large scoop of the radish salad and pile it high on the toast. You want this to be what I call a "fork-and-knife" kind of toast.
Top with more fresh cracked black pepper and enjoy!