Here is a great tea to have when you feel a cold coming on:
One thick slice of ginger
1/4 teaspoon cinnamon
1/4 lemon or 1/2 lemon juice
one cup of hot water.
You can juice the ginger and lemon and add them to the water of grind the ginger and squeeze the juice from a lemon and add them to the hot water.
Source: The encyclopedia of healing foods (Murray&Pizzorno,2005)