Adapted from a Facebook reel by Meals with Meg (copycat coffee-shop lemon loaf). Converted in the Test Kitchen to gluten-free with psyllium husk powder as the binder instead of xanthan, plus a little extra water. Psyllium can tint a crumb faintly grey-purple; that is harmless. Do not combine psyllium and xanthan in the same bake. The bake temperature and time are the creator's; the serving count is Yael's estimate. Not yet test-baked.