Farmers' Market Summer Tomato Salad

Ingredients

• 1 very small red onion, very thinly sliced
• coarse salt and freshly ground black pepper
• ½ cup milk
• ½ cup goat's or cow’s milk yogurt
• 1 to 2 tablespoons lemon juice
• 1 clove garlic, minced
• 1 tablespoon fresh chopped oregano
• 1 ½ tablespoons fresh chopped basil
• 2 teaspoons extra virgin olive oil
• 4 ripe red or yellow tomatoes
• ½" slices 1 small English cucumber, peeled and sliced
• handful of fresh basil leaves