Heat a grill or griddle to medium high. Slice Spam into 7-8 slabs and arrange on a plate or baking sheet.
Drizzle Spam with ½ tablespoon soy sauce and ½ tablespoon coconut sugar. Flip pieces and sprinkle with additional ½ tablespoon soy and remaining ½ tablespoon coconut sugar. Sear Spam until deeply browned, about 2-3 mins per side.
Whisk together mayo, sweet chili sauce, water and 1 tablespoon soy sauce. Gently toss corn with mayo mixture (to taste), pineapple and spam. Top with scallions and furikake to taste. Enjoy!