Wash and dry the mixed greens thoroughly.
Boil the eggs for 10 minutes, then cool in ice water.
Trim and blanch the green beans in boiling water for 3-4 minutes.
Place the green beans in ice water to stop cooking.
Combine mixed greens and cherry tomatoes in a large bowl.
Add drained tuna and break it into pieces.
Arrange hard-boiled egg quarters on top.
Scatter black olives over the salad.
Drizzle with olive oil and red wine vinegar, season with salt and pepper.
Toss gently and garnish with fresh basil leaves.