I’ve brought them and I use half and then she has the next half the day after I leave it in the jar it comes in the rest goes in to a bowl and warmed up for 20 seconds x
I use to float over boiling water. Microwave makes hot spots for things
It probably doesn’t need warming - you could just transfer a bit to a bowl and feed from there, and put the rest in the fridge. You could always put the bowl in the microwave for a short while if you do want to warm it.