Creating these Lemon Truffles is simple when you follow these steps:

1. Heat the Cream: In a small saucepan, heat the heavy cream over medium heat until it just begins to simmer. Do not let it boil.
2. Melt the Chocolate: Remove the saucepan from the heat and add the white chocolate chips. Stir until melted and smooth.
3. Add Lemon Ingredients: Mix in lemon zest, lemon juice, and vanilla extract until well combined.
4. Chill the Mixture: Cover the bowl and refrigerate the chocolate mixture for about 30 minutes, or until firm enough to handle.
5. Form the Balls: Once the mixture is chilled, use a teaspoon or melon baller to scoop out small portions and roll them into balls with your hands.
6. Coat the Truffles: Roll each ball in the crushed graham crackers until fully coated.
7. Set the Truffles: Place the coated truffles on a baking sheet lined with parchment paper.
8. Chill Again: Return the truffles to the refrigerator for at least 15 minutes to set completely.
9. Serve and Enjoy: Optionally sprinkle extra lemon zest on top before serving for garnish.

These steps will guide you through an incredible experience in making Lemon Truffles effortlessly.