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If the sore throat occurred immediately after the meal, then most probably it id due to allergic reaction to something in the meal. It can be a food product or oil or spices, anything. Rarely, the sore throat might be seasonal.
Try doing warm saline gargles and take any anti-inflammatory like ibuprofen or simple tylenol. If symptoms worsen, then you need to show to a doctor.
If you are having post nasal drip with a sore throat, then it might not be due to the food, but due to seasonal allergies. Again, warm saline gargles will help. If you have an allergy medicine, that should take care of both the symptoms.