Watermelon Ice Cream Tart

Name: Watermelon Ice Cream Tart
Ingredients: Green tea tart dough:; 3 ½ ounces unsalted butter, room temperature; ⅓ cup sugar; 2 egg yolks; 1 ¾ cups cake flour; 1 tablespoon matcha green tea powder; 3 watermelon ice cream bars; Jelly liquid:; A little less than ¼ cup of water; ½ teaspoon agar-agar