From my experience growing other plants, if they go purple it can be a sign of root rot or frostbite. I didn't grow broccoli though.
You didn't grow any broccoli?! Shocking. Did those sprout people get to you too?

No, it's not frostbite. They started going purple when it was still 20°C. It's not root rot either. This is good, well drained soil (one of the best vegetable growing areas in all of Canada) and it hasn't rained that much. There are broccoli plants in gardens on either side of this one that are completely green.
Broccoli periogies anyone,
hey instead of potato pancakes, how about broccoli pancakes.
Will all this go good with beer?
I like broccoli and I like perogies, but if I found broccoli
inside a perogie, I'd probably scream and whip it out the nearest window. (then dive for cover before it exploded... all in slow motion, of course)
Beer? Broccoli doesn't go with beer! Are you crazy? You need a fine wine - a cabernet sauvignon (from 2001 or 2005... or at least before the "25 questions from Bill McEwen"). Then you need to light some candles, sit back in a velvet Victorian smoking jacket (doesn't matter if you don't smoke) and make bland witty comments in a pompous British accent. At least that's how I do it.