1-First Step: Measure and Prepare Ingredients
Gather all ingredients with precise measurements. Zest two lemons, ensuring to use only the yellow part to avoid bitterness. Juice the lemons freshly rather than using bottled juice. Prepare a large microwave-safe bowl and a whisk.

2-Second Step: Blend Sugar, Lemon Juice, and Zest
In the microwave-safe bowl, combine the sugar, lemon zest, and freshly squeezed lemon juice. Whisk well to start melding the flavors before adding other ingredients.

3-Third Step: Incorporate Eggs
Add in three large eggs plus two extra yolks. Whisk vigorously until the mixture is smooth and slightly frothy, ensuring all egg components are well combined for a uniform texture.

4-Fourth Step: Microwave in Intervals
Place the bowl in the microwave and cook on high power for 45 seconds initially. Remove and stir briskly with a whisk to blend heated sections. Continue microwaving in 30 to 45-second bursts, stirring thoroughly each time to prevent curdling and achieve even thickening. This process typically takes 4 to 7 minutes total, depending on microwave wattage.

5-Fifth Step: Add Butter and Finish Heating
Once the mixture begins thickening and coats the back of a spoon, whisk in the butter cubes until fully melted and combined. Cook for a few more intervals if necessary to achieve custard-like consistency, monitoring carefully to avoid overcooking.

6-Sixth Step: Strain and Cool
For a silky smooth lemon curd, strain the cooked mixture through a fine mesh sieve to remove any lumps, cooked egg bits, or zest. Allow the curd to cool to room temperature, where it will thicken further.

7-Final Step: Store and Serve
Transfer lemon curd to airtight containers and refrigerate. Use it chilled or at room temperature as a spread, filling, or topping on desserts, pancakes, waffles, or toast. This fresh microwave lemon curd pairs beautifully with cookies and cream cupcakes or other sweet treats.