Heat olive oil (½ cups) in a large skillet over medium heat. Add shallots (6 large). Cook, stirring occasionally, until golden brown and starting to crisp, about 12-15 minutes. Remove half the shallots and reserve for garnish.

Don't rush—golden shallots take time. Burnt shallots are bitter. • Shallots are light golden brown, some edges crispy • Sweet, caramelized onion aroma

To the remaining shallots (6 large) in the pan, add anchovies (1 tin) with their oil and garlic (4 cloves). Cook, mashing anchovies with a wooden spoon, until they dissolve completely into the oil, about 2 minutes.

Medium heat only—high heat makes garlic/anchovies bitter • Oil looks slightly cloudy, no solid anchovy pieces • Savory, fishy aroma mellows into umami

Add tomato paste (5 oz) and red pepper flakes (2 tsp). Cook, stirring constantly, for 5-8 minutes. The paste should separate from the oil, turn dark brick-red, and smell toasted, not raw.

This step is critical—raw paste tastes metallic, caramelized paste tastes sweet • Paste looks like dark rust, oil pools around edges • Smells like toasted bread, not metallic tomatoes

While paste cooks, boil pasta in salted water until al dente. Reserve 1.5 cups pasta water before draining.

Salt the water heavily—it should taste like the sea • Pasta is tender but firm in center

Add cooked pasta to the pan with the tomato paste (5 oz) mixture. Add 1 cup pasta water. Toss vigorously over medium heat until the oil and water bind into a glossy red sauce that coats the pasta.

Add more pasta water if too dry—starch is the emulsifier • Pasta is evenly coated, sauce looks creamy not oily

Remove from heat. Toss with Parmesan. Top with reserved crispy shallots (6 large). Serve immediately.

Eat immediately—emulsions break as they cool • Red pasta with golden shallots on top