My prefix will later see you.
My suffix will make you calculate.
My infix will tell what's true.
My whole will make you salivate.
1 Answer
Here's a possibility:
My prefix will later see you.
See you = CU
My suffix will make you calculate.
SINE
My infix will tell what's true.
I (stands for a 1, which represents 'true' in Boolean? Or perhaps IS - what exists is true?)
My whole will make you salivate.
CUISINE
[Another (albeit weaker) possibility:]
MEATPIE. [Meat sounds like 'meet' ('will later see you'), pie sounds like 'pi' ('will make you calculate'), and t could mean 'true' in t\f (true\false) questions.]