I've not given quantities, because, I didn't measure them when I made this... but it really is one of those recipes that you don't need to measure - just whip up enough cream as you need to fill the meringues.
Whip the cream with some icing sugar and vanilla extract. You can do this by taste - start with a tablespoon of the sugar and maybe ½ teaspoon of the vanilla.
Do not over whip the cream - stop when it reaches soft peak stage. Check for flavour again, and fold in more sugar and/or vanilla if you want.
Sandwich the whipped cream between two meringues and top with strawberries.