Blanch the Beans: Snap off the stem end of the Beans. Bring a large pot filled with enough water to cover the Beans to a rolling boil. Add the Beans and cook for about half a minute. Remove the Beans and plunge them into iced water. When they are completely cool, remove and pat dry.
For the Vinaigrette: Place the lemon zest, Shallot pulp, salt, pepper, Dill and crème fraîche in a mixing bowl. Whisk in 2 tablespoon of olive oil and lemon juice to taste.
Assembly: Toss the Green Beans with 1 tablespoon of olive oil, several pinches of salt and a grind of pepper. Arrange Beans on a platter and spoon the crème fraîche vinaigrette around the Beans. Scatter the Viola petals over all and tuck the flowering Dill umbels in around the edges.
*For a lower calorie version, blend 1/2 cup cottage cheese with 2 tablespoons buttermilk and use in place of the crème fraîche.