Sugar, flour, vinegar, eggs, and water are cooked until thick, and then butter and lemon extract are stirred in. This velvety filling is poured into a baked crust and chilled before serving. Top with whipped cream if desired.

Sugar, flour, vinegar, eggs, and water are cooked until thick, and then butter and lemon extract are stirred in. This velvety filling is poured into a baked crust and chilled before serving. Top with whipped cream if desired.