Roselle leaves

Gongura

Leafy green measured by weight; no spoon or count conversion

Instead of Roselle leaves

Nothing truly replaces gongura leaves' sour, musky character; sorrel is the nearest.

Sorrel leaves
Use the same weight. Closest sour leafy substitute; cook briefly so they keep some body.
Spinach
Use the same weight and add amchoor or lemon juice to taste. Loses the musky tartness but works in dal and curries.
Red amaranth leaves
Use the same weight with a squeeze of lemon or tamarind. Less sour; adjust salt and chilli afterwards.