Preheat the oven to 450F. Line a baking sheet with parchment.
Add the carrots and fennel to the baking sheet. Drizzle with oil, sprinkle with the salt, and toss to coat.
Bake for 15 minutes, or until carrots are tender but not mushy. Once they are done, sprinkle with a generous pinch of salt and a squeeze of lemon if you have any left. Allow to cool while you make the tahini sauce (see notes below for make-ahead instructions).
In a small bowl add the tahini, miso, lemon juice and water. Use whisk or fork to mix it all together until smooth, trying to get rid of any miso paste lumps. If the sauce seems too thick, add a little bit more water (thickness will vary based on the tahini).
Transfer the carrots to a serving plate and drizzle generously with the tahini miso sauce. Garnish with hazelnuts, cilantro, and pomegranate seeds.