Is it possible to mix vegetable fats and animal fats?

Is it possible to mix vegetable fats and animal fats?
For example, in cooking, when cooking cutlets in a frying pan, first pour sunflower or olive oil into the frying pan, top it with a mixture that will make cutlets; it contains fats of animal origin.
I'm not good at cooking, but I hope my question is clear.
Timofey
Ukraine, Transcarpathia
Torah laws prohibit us from mixing meat ingredients with dairy ingredients.
In addition to these two types of products, there are also products of the third category - “neutral to them”. Let's say it's of plant origin.
They can be mixed (separately) with both meat and dairy ingredients.
So, there is no prohibition on mixing vegetable oils with meat products. And the technology for making cutlets you described is completely legitimate.
Lyricist Eliyahu Essas