Bring a large pot of water to a full rolling boil at 212°F. Salt it generously, then drop in the fettuccine. Cook for 8 to 10 minutes, stirring with tongs every 60 seconds so the strands don’t stick or clump. Around minute 7, lift a strand and bend it. It should flex easily with a slight bite in the center, and you’ll see the noodles look glossy and fully loosened. Miss this window and they’ll go too soft, which makes the final dish feel heavy. Right before draining, scoop out about 1/2 cup of pasta water. That starchy liquid is key later. Skip it and the sauce won’t cling the same way.

Set a pan over medium-low heat, about 4 on a 10-dial, and melt the butter. Add the minced garlic and stir in small circles for 60 to 90 seconds so it cooks evenly without browning. Pour in the heavy cream and let it warm for 3 to 5 minutes. You’ll see tiny bubbles forming at the edges and smell the garlic turning soft and slightly sweet. If the garlic browns even a little, the whole sauce can taste bitter. (I used to rush this step on higher heat and the garlic always turned sharp. Slowing it down fixes everything.)

Lower the heat slightly to just under medium-low, around 3 on a 10-dial. Add the parmesan in small handfuls over 2 to 3 minutes, stirring constantly in a figure-eight motion so it melts evenly. Watch the sauce closely. It should thicken enough to coat the back of a spoon and form soft ripples when stirred. You’ll notice it getting slightly heavier and smoother. Dumping the cheese in all at once will make it clump and turn grainy. Season with salt and pepper right after the cheese melts. Miss that moment and the seasoning won’t blend in as evenly.

Add the drained fettuccine straight into the sauce while everything is still hot, around 160°F in the pan. Use tongs to fold and lift the noodles in a gentle J-shaped motion for 2 to 3 minutes. At minute 1, swirl the pan once and add a small splash of reserved pasta water if it looks thick. You’ll see the sauce turn glossy and start coating every strand instead of pooling underneath. Miss this and the sauce stays heavy and uneven. (I used to just stir it flat, but lifting and folding makes a huge difference in how the sauce wraps around the pasta.)

Using tongs, twirl the pasta into loose nests onto a warm plate while it’s still around 140°F. This should take about 1 minute per portion so the noodles stay flexible. Sprinkle parsley and a little extra parmesan right away. The heat will gently melt the cheese and you’ll see a soft sheen form on top. Wait too long and the sauce tightens, losing that silky look. (I used to pile on too much garnish, but keeping it light actually looks better and lets the sauce stand out.)