Can I make this salad without a griddle?

Yes. A large skillet works well. Use medium-high heat, oil the surface generously, and give the vegetables enough room so they brown instead of steaming.

What can I use instead of Harvest Grains Blend?

Rice, farro, or another favorite grain will work. The recipe note suggests using about 1 1/4 cups of another dry grain if you prefer a swap.

Can I use different vegetables?

Yes, as long as you choose vegetables that cook in a similar amount of time or add them in stages. The important part is keeping the pieces large enough to flip and giving each vegetable enough contact with the hot pan.

Is the tahini dressing supposed to be thick?

It should be creamy but still drizzleable. Stir it well with a fork. If your tahini is especially thick, mix patiently until the olive oil smooths it out.