New answers tagged pectin
Probably the jelly is something like the brand Oetker which comes clear or fruit-flavoured. It is indeed poured warm; cheesecake will survive if it's a cm or less layer. Alternatively, boil up some apricot jam (or strawberry), take off heat a few minutes and sieve through a tea strainer over cheesecake. Keep stirring the pot if you are slow.
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