In a medium skillet over medium-high heat, melt the butter.
Add the daikon in a single layer and sprinkle evenly with 1 tablespoon of the shoyu.
Turn the heat to medium-low, cover, and cook, turning once, until the daikon is tender and both sides are deep golden brown, 8–10 minutes.
Remove from the heat, add the lemon juice and remaining shoyu, and toss gently.
Serve hot.
