Step 1

Combine yogurt, lemon zest and juice, tandoori spice blend (or curry powder), garlic, 1 tablespoon oil, 1/2 teaspoon salt and 1/4 teaspoon pepper in a medium bowl. Transfer 1/2 cup of the mixture to a small bowl and refrigerate until ready to use.

Step 2

Add chicken to the remaining yogurt mixture and stir to coat. Let marinate at room temperature for 20 minutes or refrigerate for up to 1 day.

Step 3

Preheat grill to high.

Step 4

Toss bell pepper and onion in a large bowl with the remaining 1 tablespoon oil and 1/4 teaspoon each salt and pepper. Thread the marinated chicken, pepper and onion pieces alternately onto eight 10- to 12-inch skewers.

Step 5

Reduce grill heat to medium. Oil the grill rack (see Tip). Grill the skewers, turning once, until the chicken is cooked through and the vegetables are tender-crisp, 6 to 8 minutes per side. Serve with the reserved yogurt sauce for dipping.