Simmmer.

Step 1 of 4

Key Lime Pie

Step 1 of 4

Heat oven to 325°F / 275°F fan / Gas 3. Blend the graham crackers to fine crumbs in a food processor. Mix with the melted butter and press into the base and up the sides of a 22cm loose-based tart pan. Bake for 10 minutes. Cool.

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