In southern California, spring is already giving way to summer: there are tomatoes and melons in the market. But today in Santa Monica, there was also plenty of late-season citrus to be found, including these rarities from Mud Creek.
The top fruit is—can you guess?—a lemon that's suffering an indentity crises. It's normal in shape, size and taste, but due to a mutation caused by cosmic rays or something of that sort, the mother tree produces orange fruit. That kind of thing isn't unusual in the citrus clan. The pink Cara-Cara orange is a mutant sport off of a Washington Navel orange, which was itself a mutant sport discovered in Brazil in the 1870s. The UC Riverside Citrus Variety Collection has a mutant lemon with a variegated green rind and pink flesh—it's a pink lemonade tree.
The other four fruits are limettas, also known as sweet lemons because they are generally acidless. But not these Marrakech limettas (Limonettes de Marrakech), which are anomalous in being quite acidic. (Thanks to David Karp for the ID and info.)
I think I'll use the orange lemons and limettas to make a late-season rare-lemon marmalade. Stay tuned for the taste test. UPDATE: The marmalade is pale orange and the limettas have something of the flavor and fragrance of bergamots.