The directions for whipping the egg whites is poor.
Egg whites must be stabilized as they are whipped. To stabilize egg whites you must use an acid such as cream of tartar, some sugar, and add these at the correct stage. The speed of beating is also important.
90 g egg whites 68°F (20°C)
1/2 teaspoon cream of tartar
25 g sugar
Place the sugar in the mixing bowl.
Beat on low speed until egg whites begin to look bubbly.
Add cream of tartar.
Increase speed to medium
Continue beating until egg whites turn foamy
Gradually add the sugar as you continue to beat egg whites.
After sugar is added, increase speed to medium high, then high
just an aside, if I were making this, I would dissolve the chamomile in water in a separate bowl. Then add the sugar; let it sit 5 mins to begin to absorb water. Stir with a spatula to begin to dissolve the sugar and thoroughly mixing the chamomile. Then transfer it to a pot. Still wash down sides of pot and rinse the spatula to ensure no sugar crystals are on the sides of the pan. It is not advisable to stir sugar syrup during cooking or once it is cooked as it can trigger crystal formation. If crystals are forming in your sugar syrup, it will destroy your meringue.
Egg whites before they are beaten
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egg whites bubbly stage add cream of tartar
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egg whites foamy stage, SLOWLY add sugar
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Stiff Peak
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