Lemon and almond meringue slice

Ingredients

• 150 gram butter, softened
• 1/2 teaspoon vanilla extract
• 1/2 cup (110g) caster sugar
• 1/4 cup (30g) almond meal
• 1 cup (150g) plain flour
• 395 gram can sweetened condensed milk
• 1 teaspoon finely grated lemon rind
• 1/3 cup (80ml) lemon juice
• 3 eggs, separated
• 1/2 cup (110g) caster sugar, extra
• 1/3 cup (25g) finely chopped
• toasted flaked almonds
• 2 tablespoon toasted flaked
• almonds, extra