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Generously grease a 20cm round sandwich tin and line the base with parchment. Finely crush the biscuits, either in a processor or by putting them into a food bag, squeezing out the air, then bashing with a rolling pin.
Work the butter and peanut butter into the biscuits until the mix looks like wet sand. Using the back of a cutlery spoon, press the mix evenly over the base and up the sides of the tin. Once even, go over the crumbs again, pressing and firming to a smooth crust. Chill in the freezer for 30 mins.
Beat the filling ingredients together with electric hand beaters until thick. Spoon carefully into the biscuit case, then top with about 25 strawberries. Chill for at least 2 hrs. For the sauce, use a hand blender or processor to purée 200g strawberries with the icing sugar until smooth.
When ready to serve, carefully push the very cold pie up out of the tin (standing it on something like an upturned mug will help). Sprinkle over the peanut brittle and extra icing sugar. Serve with the sauce.