Grilled Portobello Salad With Shaved Parmigiano-Reggiano
⏲ ~22 min total · prep 18 · cook 4 · 4 servings
Lunch⏱ 35 min total🔥 4.7g net carbs
By the KFI Test Kitchen · Tested & approved by Jason Lieu, KFI recipe editor
Published Sep 15, 2026 · Updated Sep 15, 2026
Ingredients
- 4 large portobello caps (about 1 lb), stems and dark gills scooped out
- 5 tbsp extra-virgin olive oil
- 2 tbsp red wine vinegar
- 1 tsp Dijon mustard, plus salt and pepper
- 5 oz baby arugula
- 4 oz Parmigiano-Reggiano, in one block for shaving
- 2 tbsp toasted pine nuts
Instructions
- Whisk the olive oil, vinegar, Dijon, salt, and pepper; brush 2 tbsp of the vinaigrette over both sides of the caps and let them sit gill-side up for 15 minutes.
- Heat a grill or grill pan to medium-high (about 450°F at the grate) and oil the grates.
- Grill the caps 4-5 minutes per side, until well marked, tender at the thickest point, and juices begin to weep onto the surface.
- Rest the caps 3 minutes on a board, then slice each into thick strips.
- Toss the arugula with the remaining vinaigrette and pile it onto 4 plates.
- Lay the warm portobello slices over the greens, then shave the Parmigiano-Reggiano generously over everything with a vegetable peeler.
- Scatter the pine nuts on top and finish with a few cracks of black pepper; serve while the mushrooms are still warm.
Why this recipe works
- A head start in vinaigrette Two tablespoons of the dressing brushed over both sides seasons the caps while they sit gill-side up for 15 minutes. The mushroom drinks it in before the grill ever lights.
- High, dry heat At about 450°F on the grate, 4 to 5 minutes per side drives off the water that makes portobellos slip and gray. What is left is meaty and marked.
- Warm on cold Slicing the rested caps onto dressed arugula gently wilts the greens where they touch, so the salad eats like a composed plate instead of a side dish.
Tips for making this recipe well
Dig out the gills
A spoon lifts the dark gills and any stubborn stem in seconds. They hold grit and can muddy the dressing gray, so this step earns its minute.
Rest before the knife
Three minutes on the board lets the juices settle back into the flesh. Slice too soon and the board floods, taking moisture your greens did not ask for.
Shave, never grate
A vegetable peeler pulled along the block gives wide, lacy curls of Parmigiano-Reggiano. Pre-grated cheese cannot do this job; the point is thin curls that drape.
Dress at the last second
Arugula wilts within minutes of meeting vinaigrette. Toss it as the mushrooms come off the grill, not before they go on.
Oil the grates well
Brushed caps plus clean, oiled grates release without tearing. A torn portobello still tastes right but falls apart on the plate.
Serving suggestions
Pile the dressed arugula across four plates, then lay the warm portobello strips over the top so the greens catch a little wilt. Shave the Parmigiano-Reggiano generously with a vegetable peeler, letting curls fall over mushrooms and greens alike. Scatter the toasted pine nuts, crack black pepper over everything, and get it to the table while the mushrooms still hold warmth. At 4.7 g net carbs a serving, this eats like a real lunch, and a lemon wedge on the side is welcome if your vinegar runs sweet.
Storage and meal prep
This one refuses to wait, so store the parts, never the assembly. Grilled caps keep 3 to 4 days refrigerated in a covered container and taste good cold or warmed in a dry pan. The vinaigrette holds in a jar in the fridge for 3 to 4 days; shake it hard before using since the Dijon and oil separate. Arugula stays undressed until serving or it collapses. Nothing here improves in the freezer, so skip it.
Variations worth trying
- Grill pan indoors A cast-iron grill pan over medium-high does the same job in the same 4 to 5 minutes per side. Open a window.
- Swap the green Baby arugula can give way to torn butter lettuce or baby spinach. Dress either one with the same light hand.
- Change the nut Toasted walnuts or slivered almonds stand in for pine nuts when the pantry runs short. Toast them dry in a skillet until they smell nutty.
- Add a soft egg A fried or poached egg on each plate turns the plate into a fuller lunch.
Frequently asked questions
Do I have to remove the gills?
They are edible but gritty, and most cooks scoop them out before marinating. Out they come with a spoon in one or two passes.
No grill?
A ripping-hot cast-iron grill pan or even a heavy skillet sears the caps well. Keep the same timing and look for the same juices weeping onto the surface.
Can I marinate the caps overnight?
Fifteen minutes is plenty because mushrooms take on liquid fast. Overnight they turn waterlogged and go limp on the grill.
What can replace the pine nuts?
Toasted slivered almonds, walnut pieces, or pistachios all work. Toast them in a dry pan until fragrant so they land in the bowl crisp, not soft.
How many net carbs?
Each serving sits at 4.7 g net carbs, with the portobello caps accounting for most of it.
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