01 -
Mix cornstarch, lemon juice, and warm water in a bowl until smooth. Cook raspberries and sugar in a pan for 3 minutes, stirring often. Add cornstarch mix, cook 3 more minutes while mashing berries. Blend in food processor and strain the sauce.
02 -
Heat oven to 325°F. Mix graham crumbs, melted butter, and sugar. Press into springform pan bottom and sides. Bake 10 minutes and cool. Wrap pan outside with foil for water bath.
03 -
Lower oven to 300°F. Beat cream cheese, sugar, and flour until smooth. Mix in sour cream, lemon juice, and zest. Add eggs and yolks one at a time, mixing gently. Mix 2 tbsp cheesecake batter into raspberry sauce. Pour 3/4 of plain batter into crust. Drop half raspberry sauce and swirl. Add remaining batter and raspberry sauce, swirl again. Place in water bath, bake 1 hour 25 minutes. Turn off oven, leave door closed 30 minutes. Crack door open 30 minutes more. Chill completely. Top with fresh raspberries and lemon slices.