If you prefer to reduce the strength of the flavor of the red onion and green pepper, mix them with the olive oil, the vinegar or lemon juice, and the oregano for up to 2 hours in advance. Marinating them in the vinegar or lemon juice will help soften them up as well as take the edge off of their taste. This salad is for 4 people as a side dish or starter or for 1 person as a main dish.