Lemon Syrup Cake with Berries and Lemon-Curd Cream

Combine first 4 ingredients in large microwave-safe bowl. Place bowl in microwave and cook on high until butter melts, whisking every minute, about 3 minutes. Remove from microwave; cool 5 minutes. Beat eggs in small bowl to blend. Whisk half of butter mixture into eggs. Return mixture to same large bowl. Place in microwave and cook on high until curd is slightly thickened but not boiling, whisking every minute, about 4 minutes (curd will continue to thicken when chilled). Transfer curd to medium bowl. Press plastic wrap onto surface. Chill until firm, at least 1 day and up to 1 week.