1. Place the quinoa in a sieve and rinse it thoroughly under running water, then drain.
2. Bring water and 1/4 teaspoon of salt to a boil in a small saucepan. Add the quinoa and bring to a boil again. Reduce heat to low, cover, and cook until the grains burst and are tender, about 15 minutes. Uncover and remove the saucepan from the heat. Let it cool.
3. In a large salad bowl, mix the green beans, red bell peppers, and shrimp, then add the cooled quinoa. Mix the lemon juice, broth, dill, remaining salt, and black pepper; mix well.