[header] How to make mixed berry slab pie [title] Gather your supplies and mix the dry ingredients. [step] You'll need to chill 1/3 of a cup (75 g) of butter and cut it into chunks. Set it aside along with 3/4 cup (145 g) of vegetable shortening. 
You should also set out one cup (240 ml) of ice water (although you may end up using less). Mix together the dry ingredients in a large bowl.