Put a large pot of water on to boil for the pasta. Salt water liberally - at least a tablespoon or more of salt.
For dried pasta: most dried varieties cook in about 10-13 minutes, so I recommend you wait for the water to boil and put the pasta in to cook just before you start cooking the salmon. Make sure you give the pasta a stir every once in a while, though, especially at the beginning of cooking, so that it doesn’t all stick together.
For fresh pasta: this cooks much quicker, so if using fresh pasta, I actually recommend you finish cooking the salmon and the kale before cooking the pasta. The salmon will be fine resting a bit, and the kale will still stay warm through the quick pasta cooking time.
Food Prep. Prep the kale, washing the leaves and discarding the tough, hardy stems. Tear leaves with your fingers into large pieces about the size of your palm, or roughly chop with a knife. Cut salmon into equally-sized fillets of about 6-8 ounces each, if necessary. Pat salmon fillets dry with a paper towel – dry salmon sears better than wet salmon, and is also less prone to sticking to the pan. Season with salt and black pepper on the side without skin.
When pasta water has boiled, add pasta. Continue to boil the pasta, stirring occasionally so the pasta doesn't stick.
Cook the salmon. Heat about 1 tablespoon of oil in a 12-inch skillet over medium-high heat. When the oil is hot and shimmering, put in the salmon fillets, skin side down. Try not to crowd them to get a good sear. Cook for 6-7 minutes. Don’t move the salmon once you’ve put it down! Pushing it about risks tearing the flesh and interfering with that nice sear you want. The salmon will be ready to flip once the flesh on the side turns from a fleshy pink to a lighter, opaque white about ¾ of the way up the sides of the thickest part of the fillet.
Cook the kale. While the salmon is cooking, cook the kale. Heat 1-2 tablespoons of olive or canola oil over medium-high heat in a large saucepan or wok. When oil is hot, add garlic and ginger and cook for about 1 minute, or until fragrant. Add kale and about a quarter cup of water, and season with salt and pepper. Cover and cook, stirring occasionally. Add more water if you notice the bottom of the pan looking dry. The kale is done in about five minutes, when it turns a deep, vivid green and is tender to the bite. Remove from heat while you get everything else ready, but don't cover the pan - the steam will overcook the kale and make it soggy and sad.
Back to the salmon. When the salmon is ready, flip salmon and cook for an additional 2-3 minutes. Salmon is done when it flakes easily. You can test for this by pressing down gently in the middle of a fillet (turn it back around first so that you’re poking the flesh and not the skin!) or by prodding it with a fork or paring knife to see if it flakes. You can also test the temperature in the thickest part of the fillet with a meat thermometer - it should read 120°F (49°C) for medium-rare, or 130°F (54°C) for medium. James and I tend to prefer salmon cooked to medium-rare or medium – that is, it’s still a bit translucent pink in the middle, like the appearance of medium rare steak. This is totally okay and I encourage you to try it – the resulting salmon is utterly tender and melt in your mouth. However, if you prefer your fish more well done, cook it for a bit longer to desired doneness.
Drain pasta and toss immediately with lots of pesto sauce.
Serve each salmon fillet with a dollop of pasta and a dollop of kale and revel in all your free time!