Step 6:

Peel, seed and chop about half a tomato. To peel, score the skin, blanche in hot water and then dunk in cold water. The peel comes off easily, but it also comes off easily on good, ripe tomatoes. Then cut in half and scoop the seeds out with your finger. Now you have lovely tomato meat without skin and without watery seeds!
 

 Step 7:

Finely chop your tomato and shallot, and mince the 1 clove of garlic. Also seed, remove the ribs and finely chop your serrano pepper (not shown). I highly suggest wearing gloves when chopping hot peppers, especially if you wear contacts as soap and water cannot and will not remove the capsaicin and you will burn the hell out of your eye. I am speaking from personal experience, unfortunately.