This is my mother's remedy for anyone feeling slightly under the weather.
A glass of cold orange juice
One uncooked fresh egg
Two teaspoons of brown sugar
Whisk together until the egg and sugar are completely stirred into the orange juice, and drink immediately.
Some might object that it's not fully vegetarian. It's certainly not vegan, but it's highly nutritious (practically a complete meal in itself) and guaranteed to make you feel better!