Preheat your oven to 400°F (205°C), and then peel & cut your butternut squash into small pieces.
Add your squash to a bowl, and then add the oil, za'atar, nigella seeds, sweetener, amchur, and salt and toss until the pieces are evenly-coated.
Place the squash mixture in a single layer on a baking sheet lined with a silpat or sprayed with oil, and bake for 15 minutes on convection mode. The oil will start to bubble and brown the squash, but don't worry about overflow.
While your squash cooks, chop your shallot and garlic. Once your squash has baked for 15 minutes, take it out and add your shallot and garlic, mixing it enough that there's a bit of oil on everything.
Put the mixture back in the oven for 10-15 minutes, until the shallot is just starting to brown.
Take the squash out of the oven and let it cool for 10 minutes, then place it in the blender along with your coconut milk and tahini. Blend everything on high for 30 seconds to 1 minute, pulsing at the beginning if needed.
Thin your soup with water or vegetable stock (if desired), then top with hemp seeds and enjoy!