Freeze the pork for about 20 minutes (not longer); remove from freezer and slice thinly.
In a skillet, place the garlic and lightly brown the pork in the oil on medium-low heat. After a few minutes, add the tomatoes, tomato paste, and bitters, stirring frequently.
Season with salt and let simmer for about 10 minutes. (Pork needs to be cooked thoroughly.)
Add the lentils to the tomato-pork mixture. Simmer until hot, stir in the cilantro, and taste. (Add additional salt or cilantro if necessary.)
In a saucepan, boil the green beans. Drain the green beans. Fold green beans into the stew and serve.