Because I can't find the exact ingredients list, I would say count 6 Syns for any oil used, either for frying off the beef or vegetables, or in the sauce they made.
But also, they could have used other things that may be synned so there's not way to really tell without the proper ingredients list...
Personally I would guesstimate at 12 Syns to be safe. You never know how much oil is used in these things
(well unless you ask them anyway
)
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