Lemony Lentil Salad with Salmon

Ingredients

• 1/3 cup lemon juice
• 1/3 cup chopped fresh dill
• 2 teaspoons Dijon mustard
• 1/4 teaspoon salt, or to taste
• Freshly ground pepper to taste
• 1/3 cup extra-virgin olive oil
• 1 medium red bell pepper, seeded and diced
• 1 cup diced seedless cucumber
• 1/2 cup finely chopped red onion
• 2 15-ounce cans lentils, rinsed, or 3 cups cooked brown or green lentils (see Tip)
• 2 7-ounce cans salmon, drained and flaked, or 1 1/2 cups flaked cooked salmon