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Nutrition Snapshot
- Asparagus and garlic both contain inulin, a fiber your gut bacteria ferment into butyrate, the fuel your colon cells burn.
- Asparagus is also one of the better vegetable sources of folate, which suits anyone filling that gap.
- The bottled dressing is the one processed ingredient and the source of the 70 milligrams of sodium, so whisk your own.
This side takes five ingredients, one skillet, and about two minutes of heat. The garlic goes into the oil first, then the cut asparagus, then the vinaigrette and the pepper. The bottled dressing is the seasoning, so you skip building a sauce. The pieces come out bright green and very crisp. Asparagus and garlic also both contain inulin, a fiber your gut bacteria feed on.
Asparagus and Garlic Both Contain Inulin, the Fiber That Reaches Your Colon Intact
Most of the carbohydrate you eat is broken down in your small intestine and absorbed there as sugar. Inulin passes straight through. Your small intestine lacks the enzyme that would split it, so it arrives in your colon whole. A fiber that reaches the colon and feeds the bacteria living there is called a prebiotic.
Asparagus is one of the better vegetable sources of inulin, and garlic contains more of it per gram. This recipe uses both. One clove of garlic is a small amount, so most of the inulin here comes from the asparagus. For more on this fiber and the other foods that supply it, see Inulin.
Your Gut Bacteria Turn Inulin Into Butyrate, the Main Fuel for Your Colon Cells
Once the inulin reaches your colon, the bacteria living there ferment it. Bifidobacteria use it most readily, and feeding them raises their share of the population. That fermentation produces short-chain fatty acids. The one that matters most to your colon is butyrate.
The cells lining your colon wall absorb butyrate and burn it for energy. Butyrate is their main fuel, while most other cells in your body use glucose carried in the blood. A steady butyrate supply helps those lining cells hold a tight barrier between the contents of your colon and the rest of your body. For more, see Butyrate.
What’s in a Serving
A serving of this dish is mostly asparagus, so that is where most of the nutrition comes from. That means fiber, including the inulin, plus folate, which asparagus contains in larger amounts than most vegetables. There is vitamin K as well, a little vitamin C, and some potassium. The olive oil adds a small amount of monounsaturated fat.
Your body uses folate to build and repair DNA and to form red blood cells. Folate also helps keep the homocysteine in your blood at a healthy level. The dressing adds the sodium and any added sugar, and the recipe card below has the exact figures. For background on both nutrients, see Folate and Fiber 101.
What to Buy: Firm Spears and a Short Label on the Dressing
Asparagus
Look for firm stalks that stand straight and tips that are still tight and closed. Loose, mushy tips mean the bunch has been sitting a while. Thin spears are the best fit here, because the heat is short. Thick ones stay raw in the center, so cut those into shorter lengths or give them another minute.
The Vinaigrette
Turn the bottle around and read the label before you buy. That quarter cup is where nearly all the sodium in a serving comes from, and most brands add sugar as well. A lower-sodium bottle with a short ingredient list is the better choice. Whisking your own from red wine vinegar and olive oil puts you in control of both.
Garlic and Olive Oil
Fresh garlic has more flavor than the jarred minced kind, which matters when it gets only a minute in the oil. Extra-virgin olive oil adds a peppery note, and a two-minute sauté at moderate heat is gentle enough for it.
The Pan
Two pounds of asparagus fills a pan. Spread the pieces out in the widest, heaviest skillet (affiliate link) you own, because a crowded pan steams them instead of browning them.
Who This Fits and Who Should Go Easy
This side fits anyone working to eat more fiber, and it pairs with any protein. It is gluten-free, and a plain red wine vinaigrette keeps it dairy-free too. At 58 calories and 2 grams of protein a serving, it stays a side, so build the rest of the meal around chicken, fish, eggs, tofu, or beans.
The same inulin that feeds your gut bacteria is also a FODMAP, a fermentable carbohydrate. In people with irritable bowel syndrome or a sensitive gut, a large helping can bring on gas and bloating. If that describes you, start small and leave the garlic clove out. Garlic-infused olive oil still tastes of garlic, because the fructans stay behind with the solids. Our Low FODMAP Recipe Index has more options.
How to Make It Your Own
To roast instead of sauté, toss the pieces with the olive oil and spread them on a sheet pan. Give them 10 to 12 minutes at 425°F, then add the vinaigrette and pepper off the heat. Roasting browns the tips, concentrates the flavor, and cooks thick pieces all the way through.
Swaps Recap
- Lower sodium: skip the bottle and whisk 3 tablespoons red wine vinegar with 1 tablespoon olive oil and a pinch of dried oregano.
- Lower sugar: most bottled vinaigrettes contain added sugar. If you build your own and want a little sweetness, allulose measures like sugar, and a monk fruit blend works when you follow the package.
- Dairy-free: a plain red wine vinaigrette is dairy-free. Check the label on any creamy dressing you use instead.
- Nut-free: every ingredient in the recipe is nut-free as written.
- Gentler on a sensitive gut: leave the garlic clove out and cook the asparagus in garlic-infused olive oil for the garlic flavor.
Storage and Make-Ahead
Asparagus is best cooked the day you plan to eat it, so buy it close to when you need it. Before cooking, stand the bunch upright in an inch of water in the refrigerator with the tips loosely covered. It will stay crisp that way for three or four days. Cooked, it keeps about three days covered in the refrigerator.
Reheating softens the pieces, so leftovers are better cold. The vinegar keeps soaking into the asparagus overnight, and a cold serving the next day tastes like a marinated salad. Add the pieces to a grain bowl, or lay them over greens with a soft-boiled egg for lunch.
Equipment
- 1 skillet
Ingredients
- 1 garlic clove
- 2 lbs fresh asparagus
- 1 tbsp olive oil
- 1/4 cup red wine vinaigrette dressing
- 1/2 tsp black pepper
Instructions
- 1. Mince the garlic.
- 2. Trim the asparagus and cut it into 2 inch pieces.
- 3. Heat the olive oil in a large skillet over medium heat.
- 4. Add the garlic and saute 1 minute.
- 5. Add the asparagus pieces and stir to coat.
- 6. Add the red wine vinaigrette dressing and the black pepper.
- 7. Stir and heat 1 minute more.
- 8. Remove from the heat and serve.
Notes
Nutrition
Vinaigrette Asparagus Turns a Two Minute Side Into Food for Your Gut Bacteria
Asparagus and garlic both contain inulin, and this recipe puts them in the same pan. Your gut bacteria ferment that inulin into butyrate, and the cells lining your colon burn butyrate for fuel. Asparagus also supplies folate. The dressing is the one processed ingredient, so read the label or whisk your own. Count a serving as one eighth of the pan.
Serve It With
Asparagus works next to almost any simple protein, and it is especially good beside fish. Honey Rubbed Salmon makes an easy pairing, and Braised Balsamic Chicken shares the same vinegar note. If you have asparagus left over, Asparagus Crepe Rolls turns it into brunch. Add brown rice or farro and the meal is finished.
