Preheat oven to 350°F. Line a baking sheet with parchment paper.
In a mixing bowl, sift flour, baking powder and salt. Add the cubed butter and using finger tips, rub the butter into the flour till it resembles breadcrumbs in texture.
Add pepper, poppy and sesame seeds. Mix well.
Slowly add iced water and mix until the dough comes together. Form into a rough ball and place it between 2 parchment papers and roll it out into 1~2mm thickness. Using a lightly floured 3″ cookie cutter, cut the crackers out and place them on the prepared baking sheet.
Chill the baking sheet for 20 minutes.
Bake for 25~35 minutes or until the crackers are lightly golden brown and crispy. Store in an airtight container.