3 tablespoons extra-virgin olive oil
4 ounces thickly sliced bacon, cut into lardons (1 cup)
2 tablespoons sherry vinegar
10 ounces cherry tomatoes, halved
1 small shallot, very finely chopped
2 garlic cloves, very finely chopped
1/3 cup chopped basil
Kosher salt
Freshly ground pepper
Cook the beans in a large pot of salted boiling water until crisp-tender, about 5 minutes. Drain the beans and cool them under cold running water. Drain well and pat dry; transfer the beans to a large bowl. In a large skillet, heat the olive oil. Add the bacon and cook over moderate heat, stirring, until golden, 7 to 8 minutes. Remove the skillet from the heat and stir in the vinegar, tomatoes, shallot, garlic and basil. Scrape the bacon vinaigrette over the beans, season with salt and pepper and toss to evenly coat. Serve warm.