Prepare a water bath by placing a pan in the oven (larger than your round baking dish) and filling it with approx. 1 inch of hot water. The water bath helps to evenly distribute the heat. Also, put your baking dish in the oven while you prepare the egg mixture, so when you pour your caramel (melted sugar) into it, the caramel doesn't harden as quickly.
Carefully place the flan baking dish inside of hot water bath in oven; ensure water does not reach to top of the dish. Bake for 1 hour in the preheated oven. Remove from water bath and allow to cool completely.
Carefully invert onto a rimmed plate, allowing caramel sauce to flow over the flan, and top with favorite berries and other fruits.