For the Soup (Normally Conv. Garden varieties ex LHR) it is sometimes also placed in the fridge in the Club Kitchen at Door 2L. However you do need to ask the crew to heat it up at the Microwave at Door 2R. They normally poor it in a paper cup for u.
Also for the hot snacks (Chix tikka rice and other ready meals, these are not in the Club Kitchen fridge but are in a galley and u have to ask the crew.
The key is to always ask as they don't mention anything about these additional items on the menu card.