Smoked beef over butter followed by pig's heart? (8)

I believe the answer is:

pastrami

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'smoked beef' is the definition.
(I've seen this before)

'over butter followed by pig's heart?' is the wordplay.
'over' becomes 'past' (I've seen this before).
'butter' becomes 'ram' (I've seen this before).
'followed by' means one lot of letters go next to another.
'pig's heart?' becomes 'i' (I can't justify this - if you can you should believe this answer much more).
'past'+'ram'+'i'='PASTRAMI'

Can you help me to learn more?

(Other definitions for pastrami that I've seen before include "Meat dish" , "Thinly sliced beef" , "Seasoned dish" , "smoked joint" , "Spicy smoked beef" .)

I've seen this clue in The Telegraph.

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