Heirloom Tomato Salad

• 1 1/2 tablespoons red-wine vinegar
• 3/4 teaspoon salt
• 1/4 teaspoon black pepper
• 1/2 teaspoon Dijon mustard
• 1/4 cup vegetable or olive oil
• 3 pounds mixed heirloom tomatoes, halved if small or cut into wedges if medium or large

Mix together red-wine vinegar, salt, pepper and mustard.
Add oil slowly, whisking constantly until dressing is emulsified.
Add tomatoes and toss in dressing to coat.
Season to taste with salt and pepper.

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