Variations: Lemon and Lime Curd: Omit the raspberries. Replace 1/4 cup (60 milliliters) of the lemon juice with 1/4 cup (60 milliliters) of lime juice, strained. Lemon and Passion Fruit Curd: Omit the raspberries. Replace 1/4 cup (60 milliliters) of the lemon juice with 1/4 cup (60 milliliters) of passion fruit juice. I like the crunch of the seeds, so I keep them, but you can strain the juice if you prefer.