Stockholm Tiger.
This was a beef cheek I 'pastramied' a couple of months ago.
Use a brine calculator for an equilibrium cure using the weight of the combined protein and enough water to cover it to determine your salt and Prague powder measurements. That way if it has to stay in the brine a day or two extra it won't over-cure.
You really need 'jewellery' dealer's (sic) scales to get the nitrate salt accurate to 0.1g.
This one took 8 days to cure with brown sugar, garlic, bay, cloves, mustard seeds, coriander, juniper, allspice and a pinch of chilli flakes added, turning every day and keeping it submerged in the bowl by a plate - don't use anything metal to weigh it down as it can react and spoil.
Pat dry and leave in a heavily peppered, garlic powder, coriander, and paprika rub - don't put salt in the rub as it's already brined.
Leave overnight uncovered in the fridge to set the rub and then about a 6 hour smoke at 225f grill temp to160f internal - I used the Kamado with a mixture of beech and apple chunks as that's what I had. Be more sparing if you're using hickory or barrel oak.
Then double wrap in foil with tons of beef dripping (or lard will do) and finish to 205f internal in the oven at 325f. Or it was about 2.5 more hours at this point until probe tender throughout.
Might as well save your BBQ fuel at this point as it's getting wrapped to keep moisture in and the smoke has penetrated at this point anyway.
Rest at least an hour, then unwrap and cool a bit more and it should slice easily without breaking up like pastrami flavoured pulled beef.
Always slice across the grain.
Pickles recipe is just off Wilson's BBQ YouTube channel. Highly recommended.
The pastrami itself was inspired by the Leroy and Lewis method on YouTube.
Just remember to cook to probe temp/butter tenderness and not specifically time.