One Pot Tomato Spinach Pasta with Parmesan

• A wide pot exposes more pasta to the measured liquid. The noodles soften evenly without a deep pool that would need draining.
• Frequent early turning prevents dry ends and clumps, but the later cook needs less movement. Released starch thickens the tomato broth naturally.
• Spinach and Parmesan go in after the burner switches off. Residual heat wilts the leaves and melts cheese without making the sauce oily. The final spinach addition softens in residual sauce without releasing extra liquid during noodle cooking.

Ingredient notes

• Spaghetti: Standard dried spaghetti provides predictable starch. Break it once at the midpoint so the strands fit within a wide pot and submerge evenly.
• Tomatoes: Crushed tomatoes contribute both liquid and body. Avoid thick tomato puree, which can catch on the pot before pasta softens.
• Broth: Begin with the exact weight and keep 120 g extra nearby. Pot width and burner strength change evaporation, so the reserve is adjustment only.
• Spinach: Baby leaves wilt quickly without chopping. Add them in two handfuls so they fold through the noodles instead of forming one compressed mass.
• Parmesan: Finely grate it for quick melting. Add off heat and toss continuously, using reserved broth only if the sauce tightens beyond a glossy coating. Reserve broth before the pasta enters the pot, not after the sauce has reduced. Add it in 30 g portions only when a sampled strand still has a firm white core. This protects the concentrated tomato flavor from unnecessary dilution.

1. 1Build the tomato broth

   Combine crushed tomatoes, broth, water, onion, garlic, olive oil, oregano, red pepper flakes, salt, and black pepper in a wide 5-quart pot. Bring to a strong simmer over medium-high heat. The pot needs enough horizontal space for broken spaghetti to spread in a thin, mostly submerged layer.

   

2. 2Cook the pasta in one layer

   Break spaghetti once and fan it across the liquid. Turn with tongs every minute for the first 4 minutes, separating any strands that cling. Lower heat to maintain an active simmer, then cook 7 to 9 minutes more. Add reserved broth only in small splashes if dry noodles remain above the sauce.

3. 3Read the sauce trail

   Drag tongs across the pot bottom. The glossy tomato liquid should leave a clear trail that closes slowly, while a noodle bends without a chalky center. If the trail fills instantly, simmer another minute. If the sauce grips tightly before the pasta is tender, add 30 g reserved broth and toss.

   

4. 4Fold in spinach and cheese

   Switch off the burner. Add spinach in two batches, tossing until each collapses around the noodles. Sprinkle in Parmesan gradually and keep turning until the sauce looks smooth and clings to every strand. Divide immediately among four bowls and finish with basil, keeping extra cheese available at the table. Lift a small bundle with tongs before adding Parmesan. The strands should separate cleanly, and sauce should cling between them rather than dripping into a watery puddle. Fold spinach in loose handfuls so every leaf meets the hot sauce.

• Use a wide pot. A narrow saucepan leaves too many rigid noodle ends above liquid.
• Turn often only during the first minutes when dry strands are most likely to stick.
• Reserve extra broth for correction, not the starting ratio. Add it in measured splashes.
• Take the pot off heat before cheese enters to preserve a smooth, glossy sauce.
• Use a pot wide enough for the broken spaghetti to fan across the surface. If the noodles form a deep stack, the bottom layer softens first and sticks. A shallow arrangement makes the early one-minute turns effective without aggressive stirring or tangling.

Serve the pasta with a lemony arugula salad, roasted broccoli, or garlic toast. Four bowls make a full weeknight dinner. Use warm shallow bowls because the starch-thickened sauce firms as it sits. Finish with torn basil and black pepper, then pass extra Parmesan separately. Keep watery side dishes off the pasta so the glossy coating remains concentrated. Choose a simple side that can be prepared while the main dish finishes.