Roasted garlic and a touch of curry pull the classic potato-and-leek combo up to a new level. Resist the urge to overcommit to curry, because this soup sings when it’s subtle. (The turmeric boost will up color, flavor, and anti-inflammatory ammo.) Lemon juice brightens the blend, a dollop of sour cream adds a beautiful tang and creaminess, and chives chime in with bite. Depending on the character of your potatoes, stir in more sour cream, and for a richer texture go with that drizzle of olive oil. For crunch, top with the crushed cashews.