Boil a pot of water, about 1 kettle. You'll need water up to approximately 2cm/1in in your roasting pan for water bath, so make sure you boil enough. As water heats up, wrap aluminum foil around springform pan, covering all bottom and wrapping up to sides.
Place springform pan inside a large roasting pan or baking sheet with slightly tall edges. Pour cheesecake batter on top of crust. Use rubber spatula or spoon to smooth into an even layer. Place baking sheet and pan in oven middle rack. Carefully pour hot water in baking sheet.
Bake cheesecake for 55–70 minutes or until center is almost set. If you notice cheesecake browning too quickly on top, tent it with aluminum foil halfway through baking.
When done, center of cheesecake will slightly wobble when pan is gently shaken. Turn oven off and open door slightly. Allow cheesecake to sit in oven in water bath for 1 hour as it cools down.
Remove cheesecake from oven and water bath, fully cool uncovered at room temperature. Refrigerate for at least 4 hours or overnight. **If topping with jellied berries, this must be done before chilling so that cheesecake and gelatin set together.**
Once chilled, use knife to carefully loosen chilled cheesecake from springform pan rim and remove rim. Use sharp knife to cut into slices for serving. For neat slices, wipe the knife clean and dip into warm water between each slice.
If not adding optional jellied fruit, you may decorate cheesecake with toppings of choice, such as fresh berries and herbs (red currant and rosemary pictured here).
Cover and refrigerate leftover cheesecake for up to 5 days.