In a bowl, mix eggs with enough mayonnaise for desired consistency. Stir in mustard, tarragon, and thyme. Add salt and pepper to taste.
Put salad mix in another bowl; mix with olive oil and vinegar, and salt and pepper to taste.
Place two slices of bread on each plate. Spread egg salad equally on slices. Top equally with Pickled Onion Salad and Melted Cucumbers. Mound salad mix alongside.