My doctor said heat it to "steaming" in the microwave, or the same time it takes to make it "sizzle"
if you like to eat hotdogs, do the same but cut them in half lengthwise first. You can also pan-fry sliced meats till they steam or sizzle- just make sure you do both sides of thicker things like bologna. The meat at the meat dept has to be cooked as well because the offending bacteria can remain on the cutting blades... harmless amount to most people except pregnant women.
If you go out to eat at subway or quiznos or a similar place, get your sandwiches toasted. If you are making your lunch ahead of time for work... cook the meat, wash your hands, and make your sandwich and package it up like normal... then you can eat the sandwich cold at work like usual, because the bacteria should all be dead already (if it was present).
Keep in mind that the risk is actually very low... and like most things in pregnancy the biggest risk is early on.
Other tips for foods-
you CAN have califonia rolls or other sushi rolls that use cooked meats if you are a fan of sushi.
You can use wine or beer in cooking, the alchohol will get cooked off with a few minutes of heat.
you can eat red meats that are cooked to "medium" (pink but not red, with no blood)
Most things are ok in moderation... you may have a cup or two of coffee- but not a pot, for example.
use common sense... most fish can be eaten up to once a week, just don't go on a seafood binge. Vary your lunches so you aren't just eating turkey sandwiches every day- that way you will lessen you possible exposure anyways.
Good Luck!
-M.