I believe the black seed you're referring is "Nigella seed". We call it "Tikur Azmud". She has a added a link at the top on how to perp it. I hope this helps
My mum: እናንተ ልጆች አታዉኩኝ! RIP Mum 💔 "አያውከንም" who uses this word in this generation? You the best!! Beside your cooking I always admire your Amharic vocabulary usage 👍🏾