Watermelon Salad recipe from Roving Chef, cookery classes in your own home

Ingredients

• 1 pound Campari or plum tomatoes, diced, drained
• 1½ cups diced seeded watermelon
• 1 large green bell pepper, seeded, cut into 1/3-inch cubes
• ½ large English hothouse cucumber, seeded, cut into 1/3-inch cubes
• ½ cup very thinly sliced radishes
• 3 tablespoons olive oil, divided
• 10 ounces feta cheese, broken into small cubes (about 2 1/2 cups), divided
• 2 onions, chopped, divided
• ¼ cup thinly sliced fresh mint leaves, divided
• ½ cup plain Greek-style yogurt*
• 1 teaspoon dried oregano