Pâtes au Thon et à la Moutarde
(paht oh tohn eh ah lah moo-tahrd)
Les Plats de Semaine: Weeknight Survival and Comfort
It is a random Tuesday, the fridge is bare, and yet, in fifteen minutes, the kitchen fills with the sharp, mouth-watering aroma of Dijon hitting warm cream. This is the ultimate French survival meal—a true pantry classic born out of necessity in mid-century France, enduring simply because it tastes like pure luxury. The grandmotherly secret here is treating the mustard with absolute respect: pull the pan off the active heat before stirring it in, letting the residual warmth awaken its volatile punch without boiling it to a bitter death. Unpretentious, deeply comforting, and completely foolproof, this is exactly what everyday home cooking is supposed to be.
Ingredients
- medium pasta shells1 lb
- extra-virgin olive oil1 tbsp
- yellow onion1 small
- kosher salt1 pinch
- chunk light tuna in water10 oz
- crème fraîche1 cup
- smooth Dijon mustard3 tbsp
- Gruyère cheese1/2 cup
- fresh chives2 tbsp
- black pepper1/4 tsp
Method
- 01
Boil the pasta in heavily salted water until exactly al dente.
Scoop out about a half cup of the starchy cooking water and set it aside before draining the pasta.
- 02
Sweat the onion in olive oil in a large skillet over medium-low heat.
Drop the onion into the pan with an immediate pinch of salt; this draws out the water, softening the alliums into a sweet, translucent base without letting them brown.
- 03
Fold in the drained tuna.
Flake the fish directly into the soft onions, stirring gently for about a minute just to warm it through and let it absorb the aromatic oil.
- 04
Stir in the crème fraîche until it barely approaches a simmer, then turn off the heat completely.
Do not skip turning off the stove; boiling the cream will ruin the next step.
- 05
Stir in the Dijon mustard off the heat.
Keeping the pan off the active flame preserves the volatile oils of the mustard, retaining the sharp, bright bite that makes the dish sing.
- 06
Bring the dish together with the hot pasta.
Dump the drained pasta directly into the skillet, tossing vigorously and splashing in your reserved pasta water until the sauce becomes glossy and binds perfectly to every shell.
- 07
Fold in the cheese and herbs, then serve immediately.
Stir in the grated Gruyère and fresh chives, taste for a generous crack of black pepper, and get it straight to the table in warm bowls.
Notes
Sourcing and substituting crème fraîche.
If you absolutely cannot find real crème fraîche, whisk 3/4 cup of heavy whipping cream with 1/4 cup of full-fat sour cream. Never use milk or low-fat yogurt, as they will split into an unappetizing mess when they hit the hot pasta.
The zero-cook sauce alternative.
If you want to skip the stovetop entirely, whisk the crème fraîche, mustard, tuna, and herbs in a large serving bowl. Dumping the hot, drained pasta directly into the bowl perfectly warms the sauce without risking a split dairy emulsion.
From Cook French in America.