is that what they call confit?
Not quite, Koukouvagia.
"Confit" means to cook something in its own grease. Traditionally duck was the primary protein done that way.
What you do is save that rendered duck fat. Then, to make a confit of duck, you cook new duck (most often just the legs) at low heat, covered by that fat. Basically you are poaching the duck in oil, at low heat, for a very long time.
Like so many other things in the culinary world, "confit" has been broadened. Now anything poached in oil, but particularly in duck fat, is being called a confit.
I have a lot of problem, though, with things like zucchini confit. I mean, how do you cook a vegetable in its own oil?