Chicken Salad with Olive Oil & Herbs

Chicken (about 3 lbs., small

Red onion, large

Scallions

Red pepper flakes or a mince hot chili

Black pepper, freshly cracked

Kosher salt

2 to 4 tablespoons white balsamic (or other) vinegar

¼ cup extra-virgin olive oil plus 1 or 2 more tablespoons