In a large bowl, toss the fennel and radicchio. Add the parsley, jalapeño and lemon zest and toss again. In a small bowl, whisk the lemon juice with the honey until the honey is dissolved, then whisk in the oil. Pour the dressing over the salad. Add the pistachios and salt, season with pepper and toss well. Let the slaw stand at room temperature for 15 minutes for the flavors to meld before serving.