Place half a teaspoon of butter in a pan and let it melt. Toast the bread on it on both sides.
On the other hand, cut the avocado into slices. Place them on top of the toast and place a radish cut into very thin slices on top of that.
Spread the black Mujjól spheres over the toast and add a pinch of lime zest. Add salt and pepper to taste before serving.
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