Add 1 tablespoon vinegar, honey, and 1 tablespoon of olive oil to a small bowl. Season with salt and pepper and whisk to combine. Set aside.
Put the chicken in a large bowl. Add 4 tablespoons olive oil, the lemon juice, and red pepper flakes. Season with salt. Put the chicken in the refrigerator to marinate for 1-3 hours. Remove the chicken from the refrigerator.
While the chicken is marinating, in a medium pot, bring salted water to a boil. Add the haricots verts and cook for 4 minutes. Remove from the heat, drain, and put them in a small bowl filled with ice water. Drain.
Heat 1 tablespoon olive oil in a large skillet over medium heat. Add the haricots verts, season with salt and pepper, and cook, stirring, for 6 minutes. Remove from the heat.
Place the haricots verts, tomatoes, and toast in a large bowl. Add the dressing and gently toss to combine. Transfer to a serving platter and set aside.
Prepare a grill to medium-high heat. Put the chicken on the grill and grill for approximately 6 minutes per side, or until they are cooked through. Remove from the grill.
Put the chicken on a platter or individual plates. Serve immediately with the haricots verts, tomatoes, and toast on the side.