In a large bowl, beat egg whites and cream of tartar on medium speed until soft peaks form. gradually beat in sugar, 1 tablespoon at a time, on high until stiff glossy peaks form and sugar is dissolved. Fold in the crackers, pecans and vanilla.
Spread onto the bottom and up the sides of a greased 9 to 10 inch deep-dish pie plate. Bake at 350° for 25-30 minutes or until meringue is lightly browned. Cool on a wire rack.
Set aside one strawberry for garnish. Slice half of the strawberries; set aside. In a bowl, mash the remaining strawberries; drain juice, reserving 1/2 cup. In a saucepan, combine marshmallows and reserved juice. Cook and stir over low heat until marshmallows are melted. Refrigerate until partially set.
Fold the sliced and mashed strawberries and whipped topping in.