In a medium bowl, combine the softened cream cheese and mayonnaise. Mix until smooth and creamy. Add the finely chopped mint and coriander, followed by the lemon zest, lemon juice, salt, and black pepper. Mix well until all the ingredients are evenly incorporated.
Take the sandwich bread slices and carefully remove the crusts.
Spread a generous, even layer of the creamy herb mixture over one slice of bread. Top with another slice and gently press to secure the sandwich.
Using a sharp knife, cut the sandwiches into triangles, squares, or halves, depending on your preference. Wipe the knife clean between cuts for neat, presentable sandwiches.