Wash the chicken breasts in cold water, then dry them with a kitchen towel, clean it with a knife, removing the remaining membranes and veins. Cut the filets prepared this way into pieces, the size of your choice, suitable for frying or grilling. Using your fist, gently tenderize. Then, crush finely chopped garlic and lemon grass on a wooden board using a knife, until the grass and garlic become an almost homogenous mass (optionally, you can also use a mortar). Put the previously prepared chicken separately on a wooden board and spray it with the Cooking Spray. Then, cover it with salt, chili pepper and sweet pepper, as well as with lemon grass, if you use its powdered form, then rub the mass created from garlic and lemon grass onto each piece of meat and put the meat into the bowl. If you use fresh chili pepper, you need to cut the pod lengthwise and get rid of the seeds from the inside, then chop the pepper finely and add it to the chicken in the bowl. At the very end, squeeze in juice from half a lime or lemon. Mix the meat in the bowl so that the surface of the meat is evenly covered with spices, cover the bowl and put it inside a fridge for about 25-30 minutes.