Add the fennel, pistachios, anchovy, basil, oil, and a pinch of salt to the mix.
Meanwhile, cook the pasta in salted water and reserve a little of the cooking water—two generous tablespoons—to put in the blender to obtain a smooth cream.
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Pour a drizzle of oil into a non-stick pan and sauté the crumbled tarallo.
Once the pasta is ready, drain it and mix it with the pesto.
Arrange it on the plate and add the crumbled tarallo.