I've put these in a stir fry a few times, & found them s good alternative to my favourite cavolo nero when I can't buy that in summer. They look like teeny tiny cabbages & taste like mild sprouts. I ate quite a few raw whilst chopping & stirring, & think they'd be good in a salad with the harder stalk removed. Also as alternative veg for those odd folks who don't like sprouts.
For any Withnail & I fans, Uncle Monty would most certainly like one of these in his lapel.