Lemon Meringue Pie with Digestive Biscuit Crust

Introduction

The filling in this lemon meringue pie is built from sweetened condensed milk, egg yolk, and a large amount of fresh lemon zest and juice, so you get a sharp citrus layer without making a stovetop curd. The digestive biscuit crust keeps the base simple, and the 45-minute bake plus 2-hour chill make it better suited to make-ahead dessert than a last-minute one.

Recipe Details

• Prep Time: 25 minutes
• Cook Time: 45 minutes
• Total Time: 1 hour 10 minutes
• Servings: 4

Ingredients

• 8 digestive biscuits (plain/tea biscuits)
• 2 imperial tbsp (36 ml / 2.4 US tbsp) butter
• 1 tin (300 ml) sweetened condensed milk
• 1-2 lemons, zested and juiced
• 1 egg yolk
• 3 egg whites
• 6 imperial tbsp (108 ml / 7.2 US tbsp) caster sugar

Instructions

1. Pound the digestive biscuits into crumbs with the end of a rolling pin.
2. Add sufficient melted butter to the crumbs to make the mixture cohesive. Mix well, then press it into the bottom of a 10 inch (25 cm) diameter, 1 inch deep pie dish. Press down firmly with the tip of a spoon to make the base.
3. Combine the sweetened condensed milk and egg yolk. Stir gently, then mix in the lemon zest and juice to taste-more will be better, but be careful not to add too much or it will spoil the texture. Do not stir too much.
4. Pour the filling into the pie dish, covering the biscuit layer.
5. Whip the egg whites until foamy. Gradually beat in the sugar until you get stiff peaks.
6. Spoon the meringue into the pie dish, sealing around the edges.
7. Bake in a moderately cool oven (325 °F / 162 °C) for about 45 minutes until the meringue is a light golden brown. The aim is to cook the meringue and partly cook the centre (unlike, say, Baked Alaska, where only the top of the meringue is flash-cooked).
8. Remove from the oven, allow to cool, and place in the refrigerator for 2 hours to set.
9. Enjoy.

Variations

• Swap the digestive biscuits for graham crackers if that is what you have. The crust will be slightly sweeter but will hold together in the same way.
• Replace part of the lemon juice with lime juice. That gives the filling a sharper, slightly more floral citrus edge.
• Use all lemon zest but add the lemon juice more conservatively for a firmer filling. You keep the citrus aroma while reducing the risk of a looser center.
• Brown the butter before mixing it into the biscuit crumbs. The crust picks up a nuttier, deeper flavor without changing the method.

Tips for Success

• Crush the digestive biscuits as evenly as you can so the crust presses into a firm, compact layer instead of a patchy base.
• When you add the melted butter, stop as soon as the crumbs look cohesive. Too much butter can make the crust greasy.
• Add the lemon juice gradually to the condensed milk mixture and stop once it tastes bright and the texture is still thick.
• Beat the egg whites and caster sugar until the meringue holds stiff peaks that stand up without folding over.
• Make sure the meringue is sealed right to the edge of the pie dish so it does not shrink back during baking.

Storage and Reheating

Store the pie in the refrigerator, covered loosely or in an airtight container, for up to 3 days. If you need to hold it longer, the lemon base will still be usable, but the meringue texture will decline.

Freezing is not recommended. Meringue tends to weep and turn spongy after thawing, and the filling can separate.

This pie is best served cold or after 15 to 20 minutes at room temperature. Reheating is not ideal; if you must warm it slightly, use a low oven at 275°F (135°C) for a few minutes, uncovered, and expect the meringue texture to soften.

FAQ

How much of the lemon juice should you actually add?

Use all the zest, then add the juice gradually until the filling tastes clearly tart but still looks thick and cohesive. You may not need every drop from all 12 lemons.

Can you use bottled lemon juice instead of fresh lemons?

Fresh lemons are the better choice here because the zest carries a lot of the flavor. Bottled juice will make the pie taste flatter and more one-dimensional.

Why did the meringue weep or pull away from the edges?

That usually happens when the sugar is not fully beaten into the egg whites or when the meringue is not sealed to the crust edge. Spread it right to the rim and bake until lightly golden.

Can you make this pie a day ahead?

Yes. Bake it, cool it, and refrigerate it for the full 2 hours to set, then keep it chilled until serving the next day.