Twitter made me do it.
A few months ago, Rick Bayless tweeted about green chorizo & I became semi-obsessed with it. I looked high and low throughout Chicago for green chorizo, and, unable to find it, decided I would have to make it myself using this recipe from Rick Bayless:
http://www.rickbayless.com/recipe/view?recipeID=236 I particularly liked this recipe as I do not have the grinder or sausage attachments for my Kitchen Aid, so I could make do with pre-ground pork & had no need to encase it.
One of the ingredients stymied me. I was unable to find spinach powder anywhere in the city. Rick Bayless answered one of my tweets to tell me I could find it on the internets, which I did, but it was outrageously pricey. I called stores, hit every bodega in town, and asked around, with absolutely no success. Finally, a couple of weeks ago, I was at Cemitas Puebla and Tony asked me about my green chorizo progress (having seen my tweets). He has, of course, had it in Mexico, but has never seen it for sale in Chicago. I told him I was stubbornly refusing to buy the spinach powder online as I was certain I should be able to find it in Chicago and at a far more reasonable price than the online vendors offered. He racked his brain, made some calls, and told me he'd look into it further. A week later, he let me know he'd found it! It turns out that you can get it through Sysco and he kindly ordered some for me. Tony - he's a mensch.
The elusive Spinach Powder
Spinach powder in hand, I procured the ground pork from The Butcher & Larder. I had been tweeting (again, sigh) about making the chorizo and asked Butcher Larder if they had ground pork on hand. Rick Bayless jumped in again & tweeted that he was sure they would have ground pork for me, Butcher Larder tweeted back that they'd get it ready and when I went in the next day, they had just prepared it per the recipe. Allow me to note that I tweet waaaaaaay too much.
Coarsely ground/slightly fatty pork from Butcher & Larder 
Next step, pulse the chiles and cilantro into a paste:
Roasted, peeled, seeded poblano, 2 Serrano's, cilantro
Pork, salt, spinach powder & the paste ready to mix
Rick Bayless advises mixing it with your hands, and so I did. I found the spinach powder to be somewhat tricky as it was sticking to the bottom of the bowl, so it took a bit of work to get it incorporated:

Finally, it sits in the fridge to let the flavors blend. I thought it was very pretty when I pulled it out and cut some off for huevos rancheros today:

Despite the generous fat marbling the pork, it was surprisingly un-greasy when fried up and pleasingly...
green.

It was
fantastic, particularly when compared with even well made store bought chorizo. Very rich and porky without the slightest hint of grease, having a strong cilantro note and the flavor of the chiles, but without being spicy. It was much lighter and fresher than your standard chorizo. I'm still surprised that I've never seen if for sale in Chicago, but considering how easy it is to make (once you find the spinach powder, that is), this is definitely going to be something I prepare on a regular basis. I may add garlic in the future and try to bring the heat level up to make it a bit spicy, it's definitely a recipe that would be easy to customize to your personal preferences. I'm wondering how it will freeze with the fresh cilantro in it - any thoughts?
"Baseball is like church. Many attend. Few understand." Leo Durocher