Add oil to a saute pot and heat up on medium-high heat.
Add garlic, onions, and pepper to pot and saute.
Add the curry powder and mix for 5 mins.
Add in tomatoes if using and saute for 2 minutes.
Add beans to the mixture and mix well then add about a tablespoon or two of water (depending on how much the beans spring water), cover, and let simmer for about 10 minutes.
Remove the cover from the pot (beans should be shriveled and tender) and continue to stir fry until water is absorbed. About another 10 minutes
Remove from heat and serve.