Stop use immediately and isolate the supply only if it is safe to do so. Keep away from smoke or a wet electrical area, and use emergency assistance if there is a fire or immediate danger.
What the observation tells you
Do not add water into an electrical problem, remove covers or try another start after the smell fades. A food odour and an electrical burning smell are different reports, but uncertainty should not be resolved by repeated operation.
A useful next step
Keep the appliance out of use for assessment. Tell the engineer when the event occurred, what was running and whether a protective device operated, without attempting to reproduce it.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.