Add a splash of veg oil to the pan and turn the heat up to medium-high. Once hot, add the garlic, ginger, shallot and chili. Saute for 1 minute, then add the pineapple juice (including the juice from the can). Stir in the remaining 1 tbsp soy sauce and the palm sugar. Lay the chicken thighs into the sauce, skin-side up. Let simmer for 15 minutes, or until the sauce is reduced by two-thirds. Serve with the pineapple slices over rice, with a sprinkle of mint.