Using a blender or mortar & pestle, blend the garlic, cilantro roots, sake & peppercorns into a paste. Add the vegetable oil to a skillet over medium heat. Add the paste & stir-fry until the aroma is released, a few seconds. Add the shiitake & stir-fry until cooked.
Add all the seasonings & fry until the sugar is blended into the mixture. Remove from the heat & let cool.
Slice pineapple into 1/2" thick rings & then cut the rings into 1/2" X 1 1/2" chunks.
Put a small amount of the cooled stir-fry mixture on each pineapple chunk. Decorate each "horse" with a few slivers of chili & a cilantro leaf.
VARIATION: Replace the pineapple with either navel oranges or firm avocado slices.