Blend peanut butter, tamari, curry paste, pickled ginger, sesame oil, and a splash of water until smooth. The sauce should be creamy and pourable. Adjust thickness by adding more water slowly.
Whisk together sweet Thai chili sauce, tamari, garlic, ginger, and chili paste. Coat the cubed steak evenly in the marinade. Let it rest so the flavors fully absorb into the meat.
Place the marinated steak pieces onto skewers. Keep them evenly spaced for consistent cooking. Add optional pineapple pieces if desired.
Preheat grill or grill pan over medium-high heat. Cook skewers for about 8–12 minutes, turning occasionally. Remove when steak is nicely charred and cooked to your preference.
Serve skewers over rice or coconut rice. Drizzle generously with peanut sauce. Add lime juice, avocado slices, cilantro, and sesame seeds for freshness.