3 tablespoons fresh lime juice
2 tablespoons yellow miso
2 tablespoons vegetable oil
1 tablespoon finely grated fresh ginger
1 large garlic clove, minced
1 1/2 teaspoons light brown sugar
1 pound large shrimp, shelled and deveined
3 scallions, cut into 1 1/2-inch lengths
1/2 cup mayonnaise
1 tablespoon sambal oelek
Light a grill or preheat a grill pan. In a bowl, whisk 2 tablespoons of the lime juice with the miso, vegetable oil, ginger, garlic and brown sugar. Add the shrimp and toss to coat. Thread the shrimp and scallions on eight 8-inch skewers.
Grill the shrimp over moderately high heat, turning once, until lightly charred and cooked through, about 5 minutes.
In a small bowl, whisk the mayonnaise with the sambal oelek and the remaining 1 tablespoon of lime juice. Serve the shrimp with the sambal mayonnaise.