Grate 1 teaspoon rind from oranges; set grated rind aside. Peel and section 3 oranges; set sections aside. Squeeze enough juice from remaining 2 oranges to measure 1/2 cup juice. Combine juice and honey in a small saucepan; bring to a boil. Reduce heat; simmer, uncovered, 8 minutes or until mixture is reduced to 1/3 cup, stirring occasionally. Cool juice mixture.
Combine cooled juice mixture, grated orange rind, vinegar, and mustard in a jar. Cover tightly, and shake vigorously.
Combine watercress, arugula, and endive in a salad bowl; add juice mixture, and toss gently to coat. Arrange greens mixture evenly on 4 salad plates; top with orange sections and strawberry slices.