Feel free to prep the sauce and skewer the beef ahead of time.
Preheat grill to high (450°F to 550°F). Combine yogurt, dill, rind, juice, and 1/4 teaspoon salt in a small bowl; stir well.
Cut steak into 16 (4- x 1-inch) strips. Toss with oil; sprinkle with coriander, pepper, and remaining 3/4 teaspoon salt. Thread 2 strips onto each skewer.
Place skewers on a grill grate coated with cooking spray. Grill, uncovered, 90 seconds on each side or until slightly charred. Serve with yogurt sauce. Garnish with onions, if desired.
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