Grilled Tomato Salad with smoky knob onions, garlic chives and sesame - Rick Bayless

Ingredients

• 3 garlic cloves, peeled
• 1 to 2 chipotles en adobo, stemmed, seeded and roughly chopped
• 1/2 cup vegetable or olive oil, plus a little extra for grilling the vegetables
• 2 teaspoons toasted sesame oil
• 1/4 cup balsamic or sweet sherry vinegar OR 3 tablespoons red wine vinegar plus 1 tablespoon Worcestershire
• Salt
• 2 knob onions (ones with a 1-inch bulb have the best taste and texture in my opinion) or green onions , roots and withered tops trimmed off, wilted outer leaves removed
• A handful of garlic scapes or chives
• 2 pounds (4 medium-large round) firm-ripe tomatoes, cored and sliced ½ inch thick
• Freshly cracked black pepper