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For the ice cream, tip the berries into a food processor with the lemon juice, sugar and glucose, if using. Blitz until smooth. Push the raspberry purée through a fine mesh sieve into a bowl. Whisk the rest of the ingredients together in another bowl for 5 mins until thick, then spoon into a freezerproof container or large loaf tin. Ripple through the raspberry purée using a skewer. Cover and freeze overnight.
Heat the oven to 180C/160C fan/gas 4. Line two large baking sheets with baking parchment. Mix the peanut butter and sugars together in a bowl with a large pinch of salt. Beat in the egg until you have a stiff dough. Break off cherry-tomato-sized lumps of dough (you should get about 16) and arrange on the baking sheets, well spaced apart. Press the cookies down with the back of a fork. Bake for 10-12 mins until golden. Leave to cool on the sheets. Once cool, sandwich a scoop of ice cream between two cookies just before serving (you should use half the ice cream). The remaining 500ml ice cream will keep frozen for three months.