For those who have relatively low stomach acids and get stomachaches from burgers (especially the more cooked ones), Moru a south Indian spicy yogurt drink (I make it here in the Bay area with Kefir or Fil Mjolk) relieves it magically.
Yogurt/Kefir diluted with spring water
Add to this:
Mashed serrano/jalapeno/thai chilis
Diced and mashed ginger
Shake, keep in fridge and drink as an appetite stimulant, protein digestor, general digestive before, during or after a meal. It is also delicious.