Most deities have their own preferences, either in food or drink, even in colors, tools, weapons etc. whatever you can think of. But it is hard to know in detail what are the things they prefer, we just have to be very attentive to the things that surround each deity and the way they behave towards those same things. When dealing with the goddess Freyja, those who do spiritual-work with her or are able to see her Halls, note that the predominant colors in garments, flags, tapestries and so on, are the white, gold, red and green, even those who work at her Hall somehow wear those colors, even Freyja use them. At Freyja’s table there is always some kind of food and drink made from fruits, it seems that she prefers food and drink that contain fruit in it. There is also a lot of honey and wine. Since she is a Vanir deity, it isn’t a surprise to see pork as the type of meat served at her Halls.
To do spiritual work with her, she prefers female spiritual-workers, most of the information we have about her and her halls, came (and still comes) from women. There are also male spiritual-workers with her of course, but those are too few. Male spiritual-workers are easier to be accepted when these have a warlike background, in this aspect many women are also accepted.