The tastes of caviar and truffles are noticeable but not overpowering. As a result, they’d need to be carried on some form of ostensibly uninteresting substrate. Both items would shine in an omelet or a pasta meal. A ravioli in broth with packed ravioli may be fantastic.
What is your motivation for doing so?
Black truffle is an exquisite delicacy, whereas lumpfish caviar is cheap junk food solely used for adornment.
Replace the lumpfish caviar with shaved truffle on top of a scrambled egg.