The Sandvich is usually used as a portalble Medkit as it heals the Heavy's health to its maximum, however using it is risky, as it makes a lot of noise, alerting others to your presence. Once eaten, it cannot be used for another ten seconds, leaving you vulnerable to a Spy's backstab or a Sniper's bullet.
When Alt-Fire'd, (MOUSE2 by default) the Heavy will drop the Sandvich, which stays on the ground and acts as a medium-sized medkit, healing 50 health. However, when you are killed while holding the Sandvich, enemies can heal from it.
1. Deploy the Sandvich in a hostile zone near a group of wounded teammates if no Medics are available.
2. Find a safe area to eat the Sandvich, where you can be safe for at least four seconds.
3. Remember that when dropped, the Sandvich will heal your teammates.
4. Perform a quick Spy check (sweep the minigun all around you) before you eat the Sandvich. This ensures that you will be able to eat your lunch in peace..