Separate watercress into from its tough parts and soft leaves.
Chop spinach leaves.
In a large bowl, whisk together the olive oil, vinegar, tarragon, salt, and pepper until blended.
Set to the side.
Fill a bowl with water and add lemon juice.
Cut apples into strips of 0.
5-inch thick and 2 inches long.
Place the crabmeat into a bowl and separate it into small bite sized pieces.
Drizzle the vinaigrette and add the chives to the crab meat.
Drain and pat dry the apple strips and add them to the crabmeat.
Toss to combine, add the watercress and toss again.
Dress the plate with a lettuce leaf and place the crabmeat on top.
Top with the watercress salad and serve.