Originally Posted by This is not your pork!
"... in the end the coriander was not available as seeds but only as powder... "
You could try looking somewhere like here:
I use a lot of coriander seed making biltong and I can pick it up in 2kg bags at the Indian supermarkets in London. I also get other spices in much larger quantities than in british supermarkets (so cheaper as well) as well as things like garlic powder etc that are not normally stocked in European supermarkets. Check them out to see if they have cracked black pepper in a larger grade than you currently use.
Use a mortar & pestle or spice grinder to crush the coriander for pastrami etc. - you can roast the seeds first yourself as well.
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