Poached Halibut Salad with Meyer Lemon Vinaigrette

Name: Poached Halibut Salad with Meyer Lemon Vinaigrette
Cuisine: American
Ingredients: 10 ounces halibut, or 2 small filets (about 4-5 ounces each); 2 handfuls baby arugula or other baby lettuce; 1 handful mache lettuce; 4 radishes (thinly sliced); 8 cherry tomatoes (halved); 1 shallot (peeled and very thinly sliced); 2 Tbsp chopped fresh dill; pansies or other edible flower; 1/4 cup Meyer lemon juice; 1/4 cup olive oil; 1/4 tsp mustard; salt and pepper to taste