You’ll definitely want your friends and family popping in for this cake. The almond meal and sour cream in this cake make it extra-moist and luscious. If plums are not in season, you can substitute fresh plums with tinned plums. Just be sure to check the added sugar content! Alternatively, substitute the plums with another fruit which is in season. The plums go beautifully sticky when they are baked and the cake batter rises beautifully around them.