Finish the spinach
In the same pan used to cook the spinach, heat a generous drizzle of olive oil on medium-high until hot. Add the remaining ginger and cook, stirring occasionally, 30 seconds, or until fragrant. Add the drained spinach and cook, stirring occasionally, 30 seconds to 1 minute, or until well combined. Add the butter and cook, stirring frequently, 1 to 2 minutes, or until melted. Season with S&P to taste. Transfer to a plate and wipe out the pan.