Grilled Halibut with Charred Tomato Vinaigrette - Miz En Place

Ingredients

• 2 pounds heirloom tomatoes (sliced 1/4 inch thick)
• 4 6- to 8-ounce skin-on halibut fillets
• 6 tbsp olive oil, plus more for grilling and drizzling
• Kosher salt
• Freshly ground black pepper
• 12 ounces on-the-vine cherry or cocktail tomatoes
• 2 tbsp white wine vinegar
• 1/4 cup chopped chives
• 1/2 cup basil leaves, torn
• Flaky salt, for serving