Line a baking tray (approx. 35 x 40 cm) with baking paper. Wash, clean and puree 250 g strawberries. Beat the egg whites, lemon juice and 1 pinch of salt until stiff with the whisks of the hand mixer.
While continuing to beat, add 125 g sugar and continue beating until the mixture is firm and shiny.
Remove 50 g of the strawberry puree, chill the rest. Mix 50 g strawberry puree and starch. 1⁄3 Pour meringue into a bowl and stir in the starch puree. Fold this strawberry meringue briefly into the rest of the meringue so that streaks appear.
Spread the meringue in 6 round blobs (each approx. 9 cm Ø) with sufficient space on the baking tray. Use a tablespoon to press a depression into each blob. Bake in the preheated oven (electric cooker: 125 °C/circulating air: 100 °C/gas: not suitable) for approx. 2 hours.
Switch off the oven and let the meringue cool down overnight.
Wash, clean and halve 250 g strawberries. Mix with 1 tablespoon of sugar and chill. Whip the cream until stiff and allow vanilla sugar to trickle in. Pour into the meringue shells. Spread strawberries on top.
Sprinkle Pavlova tartlets with the remaining puree and serve immediately.