The virtues and drawbacks of macronutrients such as fat, carbohydrate and even protein are under intense scrutiny these days. But amid the raging debate between low-everything diets, nobody has anything bad to say about fiber.

Fiber is a general term for non-digestible carbohydrates like cellulose and lignin. Although we can't derive energy or nutrients from these particles, they exert their goodness in other ways, such as feeding the microbes in our gut, scrubbing your pipes like an intestinal Brillo pad, and helping to regulate blood sugar and fat.

The easiest way to consume loads of fiber is to drink it. Whether it's a powdered supplement stirred into a glass of water, or a delicious green smoothie in the heat of summer, drinking fiber is the stealth way to get it down — compared to, say, masticating your way through a pile of whole grains, stems and leaves. While it is possible to overdo it on fiber, more people are probably eating too little than too much.

Fiber does what it does, regardless of how long the actual, literal strands of fiber are. And when chopped small enough, you may not even realize you're eating fiber. With some supplements, like psyllium husk, you are eating a plant equivalents of random animal parts you eat in hot dogs.

The beauty of a green smoothie is that you take your fibers easily and deliciously, in the form of fresh fruits and veggies. The wintertime analogy to this dish is pureed soup. I call it "winter purry," because when I'm sitting all winter cozy with my bowl of soup, I feel purry like a happy cat in a splash of light.

The same way a summer smoothie, cold and fruity, quenches the thirst of a hot day, a good winter purry offers a seasonal antidote that's similarly vitamin-rich, but warming.

There are endless ways to make a purry, but most recipes can be simplified to a few basic steps and ingredients.

You'll need some good stock or broth, either of meat, vegetable, mushroom ... it really doesn't matter. I keep a jar of Better Than Bouillon paste, which is an excellent substitute for homemade. But really, if a kitchen is halfway organized there's no reason to run out of homemade stock.

You also will need some sort of tool with which to puree your purry. They come in many names. La Machine. Vitamix. Food mill. I use the immersion blender, which I call The Tool. I like it because you can leave the purry in the pot, and don't even have to wait for it to cool.

Finally, you need your fiber-filled winter vegetables, prepared in a way that softens them for your tool. They can be roots like carrots; stems like celery, seeds such as lentils, fruits a la tomato, florets from broccoli and the like, and various leaves.

The drill is simple. Sauté the onion in oil with spices. You don't even need to cut the onion super small, because it will be soft, and because we have our tools. Meanwhile, prepare your other veggies by steaming until soft-either separately in the steamer, or added to the steamer in proper order (roots and other hard things first, leaves and other soft parts last). When the onions are translucent, transfer the softened veggies to the pan of onions and allow to cook, along with some minced garlic. When it starts to brown deliciously, deglaze with several cups of stock and simmer with the lid on for 20 minutes or so. Allow it to cool to a point your tool can handle, and puree.

Alternatively, just cook your favorite veggie-based meal — say, a stir-fry — and then hit it with your tool. It probably will be great.

No vegetable epitomizes the green smoothie like kale, and there is a place for everyone's favorite leafy green roughage in the winter purry as well. But you have to be careful not to overdo it, as happened last week when I thought I could just substitute pureed kale for spinach and make a cheesy saag paneer. I practically overheated my poor tool on that kale, as I had neglected to remove the stems. The dish tasted OK, but as it cooled it hardened into something like Kevlar-reinforced green concrete.

The trick, I've since learned, is to first make the kale into chips, and then crumble them into purry. On that note, here is a recipe for kale and cauliflower purry, adapted (and renamed) from the Williams-Sonoma Vitamix sales literature. Since cauliflower is the new kale, according to Bloomberg, this seems like an appropriate combination, a blended blend of the old and new "it" veggies. To boot, the greenhouse-grown kale that's in season right now in cold regions, and available at local winter markets, is some of the tastiest you will find. The cold weather keeps the leaves sweet and tender.

Kale and cauliflower purry

Ingredients:

1 head of cauliflower, deconstructed into florets, with the larger ones sliced in half

Olive oil, salt, pepper, garlic powder

8 or so cups of stock or broth

Bunch of kale, leaves stripped and torn into evenly-sized chunks, about 2-inches across

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3 sticks celery

1 onion

Herbs and spices

Directions:

Preheat oven to 400 degrees.

Toss the cauliflower in olive oil, salt, pepper and garlic powder. Place them in the oven on a baking sheet.

Toss the kale with the same oil and spices as the cauliflower, and spread them on a tray.

After the cauliflower has been in the oven for about 25 minutes, reduce heat to 300. Add the kale tray to the oven. Monitor the chips closely as they cook, and take them out before they get too crispy, as they will continue to crisp after you remove them. You want them bright green and shiny with oil. Remove the cauliflower when it's done.

In a heavy bottom pan, sauté the onion and celery. Add the garlic, and a few minutes later, the stock and cauliflower. Cook, covered, until everything is tool-tender. The kale chips can be added before it is pureed, or after, as a garnish. Or both. This purry can handle many different spices, from harissa to herbs de Provence; I take mine with a mix of toasted and crushed cumin and coriander seeds.

To serve, ladle into bowls or a steaming cup, and sip your fiber pleasantly.

Ari LeVaux writes Flash in the Pan, a syndicated weekly food column carried in more than 60 newspapers nationwide. Though his audience is national, he says he "always writes about Montana. Usually."

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