Remove the feta cheese from its packaging and drain off the residual liquid. Pat the cheese dry with a paper towel.
Cut the feta into cubes and arrange in a deep glass dish or glass jar like a mason jar.
Arrange the fresh oregano and lemon wedges on top of the cubes of feta and pour over the olive oil. You want to make sure you pour in enough olive oil so that the cheese is fully covered with oil and there are not pieces exposed to air.
Cover the dish with plastic wrap or a tight fitting lid (if using a jar, screw on the lid) and chill for at least 3 hours, preferably overnight.
Serve with warm flatbreads and tomato salad.