Use enough butter to cover a 9 inch spring form pan. Next use enough graham cracker crumbs to cover up the butter. (Do this like you would flouring a cake pan.)
Next mix cream cheese and sugar with electric mixer until well blended. Add eggs, one at a time, mixing well. Blend in vanilla and lemon extract. Pour over crust. Bake at 450 degrees for 10 minutes. Reduce oven temperature to 250 degrees and continue baking 35 minutes. Loosen cake from rim of pan. Cool before removing rim of pan.