Rinse the watercress thoroughly. Be sure to separate the stalks while washing to remove any grit. Chop off the coarse ends of the stalks
Soak in Microdyne solution ( if you're in Mexico or Guatemala)
Cook the watercress in boiling salted water until slightly tender (about 3-5 minutes)
Meanwhile, dice the onion, garlic clove and tomato ( removing seeds) finely.
Beat eggs until foamy
Drain the watercress in a colander, squeezing water out with your hands and then chop in a food processor
Fold chopped watercress, onion, garlic and tomato into egg mixture and stir
Heat oil in a large Teflon frying pan to medium high
Ladle spoonfuls of the watercress egg mixture onto frying pan or griddle and flatten with spoon until the size of a coaster, pushing egg toward centre if it spreads in the pan to keep the shape more or less circular
Cook until browned on bottom,3-5 minutes. carefully turn fritters and cook until browned another 3-5 minutes.
Remove from heat, drain on paper towel and garnish with thinly sliced red onion and crumbly white cheese.