Preheat the oven to 425 degrees and line a baking sheet with parchment paper.
Add all of the squash ingredients to a bowl and toss to combine. Transfer to a baking sheet and spread in an even layer. Place in the oven and cook for 20 minutes. Toss and cook for 10 more minutes. Remove from the oven.
While the squash is roasting, add all of the dressing ingredients to a blender or food processor and blend until smooth. Add as much water as you need to thin - I used almost 1/2 cup. Taste, adjust the seasonings and set aside.
Remove the kale from the stems and rip into bite-sized pieces. Add about 1/3 of the dressing to the kale and use your hands to massage it into the kale. Place in the fridge to chill while the squash finishes.
To assemble, add 1/2 of the squash and red onions to the kale and toss. Add a little more dressing and top with the rest of the squash and red onion. Sprinkle with vegan parmesan and serve.
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Notes
Tahini is naturally bitter, so you need the other ingredients to add some tang. Adjust as you need until it fits your taste.
You probably won't use all of the dressing. Store the leftover dressing in the fridge for 3-5 days.
If you have the time to make the dressing ahead of time, I would massage it into the kale and let the salad chill in the fridge for at least an hour.