How to Make It
Stir together cream cheese, peas, radishes, mayonnaise, tarragon, lemon zest and juice, salt, and pepper in a bowl. Spread mixture evenly on 1 side of 9 bread slices (about 2 tablespoons each). Top evenly with pea shoots. Top with remaining 9 bread slices. Trim and discard crusts. Cut sandwiches in half. Chill, covered, until ready to serve or up to 1 day.