Here's the innards of a 'Long Black Spanish' seedling that pretty obviously was from an outcross to the 'Roseheart' growing nearby. I sliced this one and two normal 'Long Black Spanish' and put them in distilled white vinegar and salt to make overnight/fresh pickles. Pickling tames the bite in addition to adding salty-sour goodness. It also spread the pretty pink color all throughout the slices. Pretty tasty way to eat radishes!
And now I know the purple-tinted seedlings are probably all outcrosses. I'll be saving a bunch of these overwinter in the fridge for replanting in the Spring. That way I can get to see what kind of variation the F2 population will have.