Place the pumpkin, evaporated milk, peanut butter, chopped green onions, garlic, cilantro, lime juice, soy sauce, sugar and cayenne pepper in blender or food processor; cover. Blend until smooth.: The aroma when you blend these ingredients is full and nutty, with fresh citrus notes from the lime juice and a green lift from the cilantro . You should hear the motor hum steadily and see a uniform, glossy sauce with no visible streaks. This smoothness matters because it helps the sauce cling to the chicken and creates an even dipping texture. A common mistake is underblending, which leaves chunks that separate when heated. If that happens, blend in short bursts and scrape the sides, aiming for a cohesive, velvety consistency.
In a medium bowl, combine 1/2 cup of the pumpkin mixture with the chicken; cover. Reserve the remaining pumpkin mixture. Marinate the chicken in the refrigerator, stirring occasionally, for 1 hour.: As the chicken soaks in the marinade, you should notice the meat taking on a faintly orange tint and the scent becoming nuttier and brighter. Marinating for about an hour allows the flavors to penetrate without breaking down the texture of the chicken . I always stir the bowl once during the hour so every piece is coated evenly. A typical error is marinating too long, which can make the surface mushy; stick to about an hour for best texture. Refrigeration keeps the meat safe while it absorbs the sauce.
Take chicken pieces out of their marinade, and alternately thread the chicken, bell peppers and green onion pieces onto skewers.: When you thread the skewers, you should feel the resistance of the meat as it slides on and the slight snap of the bell pepper and green onions . Arrange the ingredients to create a balanced skewer that cooks evenly, alternating chicken with vegetables so each bite has contrast. Visually, the skewers should look colorful and inviting. A common mistake is crowding pieces too tightly, which prevents even cooking; leave a little space so heat circulates around each piece.
Preheat the grill or broiler. Grill or broil, turning once, for 10 minutes or until the chicken is no longer pink. Heat the remaining pumpkin mixture; serve with satay for dipping.: Preheating ensures immediate sizzle and attractive browning. As the skewers hit the hot surface, listen for a steady sizzle and watch for golden edges and faint char marks on the vegetables. Turning once helps develop even color, so aim to flip at about the halfway mark. Cook until juices run clear and the chicken is opaque through the center. While reheating the reserved sauce, keep it warm but not boiling, which preserves its texture. A frequent slip is overcooking the chicken , resulting in dryness, so monitor closely and remove when just cooked through.
