Slice the tomatoes and arrange them on a serving platter.
Place the onion slices in a colander and rinse them, first under hot tap water, then under cold water.
Pat dry and arrange on the tomatoes.
Drizzle with the olive oil and lemon juice and sprinkle with the remaining ingredients.
Allow the flavors to combine for 15 minutes and serve at room temperature.
Calories: 265kcal | Carbohydrates: 1g | Protein: 0.2g | Fat: 30g | Saturated Fat: 4g | Polyunsaturated Fat: 3g | Monounsaturated Fat: 22g | Sodium: 4mg | Potassium: 49mg | Fiber: 0.3g | Sugar: 0.2g