Steam green beans for about 5 min.
Meanwhile cook baby potatoes (about 8 min in boiling water). Drain and slice in half.
Add green beans, smoked salmon, and potatoes to a large bowl. Thinly slice the red onion and radishes and add to the bowl.
Make your dressing: In a small bowl, add lemon juice, dijon mustard, shallot, olive oil, salt and pepper. Whisk until combined.
Poach your egg: crack your egg into a shallow bowl. This will help to ensure a safe toss into the water. Once your water is boiling, use a spoon and stir until you create a little swirl/tornado in the water. Carefully drop egg in and stir continuously making sure to keep it in the swirl. After 30 secs use a slotted spoon to remove egg.
Pour dressing over salad and then top each plate with a poached egg. Enjoy!