Bring 6 cups of lightly salted water to boil. Add green beans and blanch for 4 minutes. Drain. Immediately immerse drained beans in an ice water bath to stop cooking.
In a small saucepan, combine 1 1/2 tsp. of olive oil and all remaining ingredients. Warm over medium heat until the ingredients start to combine, about 7 minutes.
Toss green beans in remaining olive oil and season lightly with salt and pepper. Quickly grill the beans on a hot grill, about 30 seconds on each side.
Toss the beans in warm vinaigrette and serve immediately.
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