(Nutrition information is calculated using an ingredient database and should be considered an estimate.)
In a small saucepan, whisk together the eggs, egg yolk, lemon juice, lemon zest, and sugar until smooth. Bring to a simmer over medium-low heat and cook, whisking continuously, until the mixture thickens to cover the back of a spoon, about 5 minutes.
Remove bowl from heat and add Country Crock® Plant Butter, whisking until completely melted.
Strain curd through a fine mesh strainer into a bowl.
Cover with plastic wrap so that it touches the top of the curd to keep it from developing a skin. Chill at least an hour.
High-speed blender method:Alternatively, add the eggs, egg yolk, lemon juice, lemon zest, and sugar to a high-speed blender. Blend on high speed for 5 minutes. With the blender on low, remove the lid plug and add the plant butter, one tablespoon at a time. Blend for 1 minute longer. Carefully remove the lid as it will be very hot. Transfer curd to a bowl and cover with plastic wrap so that it touches the top of the curd to keep it from developing a skin. Let cool to room temperature then chill at least an hour.