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5 tbsp coarsely crushed black peppercorns (use a pestle and mortar or a spice grinder)
Hm, that could be a typo of 'tbsp' instead of 'tsp'. A bit of a basic mistake to make, so I'd be very surprised if it were. Still, there's a good reason why quantity of pepper is usually not specified in recipes, although with recipes like this with it as a key ingredient and not just seasoning, of course there needs to be some kind of guidance. Not having tried the recipe, I'd say 5tsp would seem plenty to me and I'd probably try that first.
They're only meant to be coarsely ground, which should reduce the heat, but of course with 5tbsp even that might not help.
https://ottolenghi.co.uk/recipes/black-pepper-tofu-a
You could always write in to complain/request a check.
I once made his black pepper tofu.
It took me half an hour to grind the pepper in a pestle and mortar. Then another half an hour to make the dish.
It was so hot as to be nearly inedible. ms mashton was proper furious.