First, prep salmon. Ideally, the skin is removed. If not, it can be removed later. Top with salt, coconut aminos, and chili garlic sauce to briefly marinate. Set aside.
Heat a large rimmed skillet or pot over medium heat. Once hot, add oil or water. Then add shallot, ginger, and serrano pepper and sauté for 3-4 minutes, stirring occasionally. Next add garlic and cook for 1-2 minutes more, stirring frequently, lowering the heat if it begins to burn.
Add red curry paste and sauté for 2 minutes, stirring frequently (turn down heat if browning or burning). Then add red bell pepper and a pinch of salt and sauté for 2-3 minutes. Add coconut milk and stir to combine. Then bring to a low simmer over medium heat. Cook for 2 minutes.
Add coconut aminos and maple syrup, starting with the lesser amount and working your way up to taste. Taste curry and adjust flavor as needed, adding more salt to taste, coconut aminos for depth of flavor / umami, maple syrup for balance / sweetness, or curry paste for more intense curry flavor.
Once you have the curry to your liking, add the salmon (see note below for separate pan/crispier skin option). Cover and cook through (~5 minutes).
NOTE: If your salmon has the skin on, add the salmon skin side down. Cover and cook for 2-3 minutes, then carefully flip, peel off skin, and cook through. If you have trouble peeling the skin off, continue cooking; it should peel off once cooked through. For a third cooking option, see notes below.
In the last 1-2 minutes of cooking, add the kale, cover, and cook until wilted. Serve as is, or with rice of choice, lime juice, and fresh herbs such as cilantro.
Store leftovers covered in the refrigerator for 2-3 days and reheat on the stovetop or microwave. Not freezer friendly if salmon has been added (as it doesn’t reheat well).
*Nutrition information is a rough estimate calculated with 4 ounce filets, the lesser end of the ranges for serrano, coconut aminos, and maple syrup, and without optional ingredients. *If you’d prefer crispier salmon, cook in a separate pan in a bit of oil over medium heat, flipping once to ensure it cooks evenly. To serve, add the salmon to a serving plate along with curry and desired sides / garnishes.