Sous Vide Tuna Salad Nicoise

Ingredients

• 2 teaspoons salt
• 2 teaspoons sugar
• 2 8-ounce tuna steak, about 1 inch thick
• 3/4 cup extra-virgin olive oil
• 1/4 cup lemon juice (2 lemons)
• 1 shallot, minced
• 2 tablespoons chopped fresh basil
• 1 tablespoon minced fresh thyme
• 2 teaspoons Dijon mustard
• 1 1/4 pounds small red potatoes, unpeeled, quartered
• 2 teaspoons extra-virgin olive oil
• 8 ounces green beans, trimmed and halved crosswise
• 4 large eggs
• 1 head Bibb lettuce (8 ounces), leaves separated and torn into bite-size pieces
• 8 ounces cherry tomatoes, halved
• 1 small red onion (about 4 ounces), halved and sliced thin
• 1/2 cup pitted niçoise olives
• 2 tablespoons capers, rinsed (optional)