Heat oven to 350°F and mix pretzels, melted butter and 3 tablespoons sugar.
Press into a 9-by-13-inch glass dish and bake for 10 minutes; cool completely.
Beat cream cheese with 3/4 cup sugar, fold in whipped topping and spread to every edge of the cooled crust.
Refrigerate for 30 minutes while dissolving gelatin in boiling water.
Cool gelatin until room temperature, stir in strawberries and carefully pour it over the sealed cream layer.
Refrigerate for at least 4 hours until firm and cut into 20 squares.