While tadka is traditionally used in savory dishes to enhance flavor, it's generally not added to sweet dishes. The combination of spices and hot oil or ghee typically clashes with sweet flavors.
Tadka, also known as tempering, involves heating oil or ghee and then adding spices like mustard seeds, cumin seeds, dried chilies, and curry leaves. This process infuses the oil with the aromatic essence of the spices, which is then poured over a dish. The purpose of tadka is to add a layer of complex flavor and aroma.
In savory dishes, the spices in tadka complement the existing flavors, adding depth and warmth. However, in sweet dishes, the strong, often pungent, flavors of the spices in tadka can overwhelm the delicate sweetness and create an unpleasant contrast. The savory and spicy notes typically don't harmonize well with the sweet profile.
There might be very rare exceptions where a *very* subtly spiced tadka could be used in a sweet dish to create a unique flavor profile, but this is highly unconventional and requires careful consideration of the specific ingredients and flavors involved. Generally, it's best to avoid adding tadka to sweet dishes.
Instead of tadka, consider using aromatic extracts like vanilla, almond, or rose water to enhance the flavor of your sweet dishes. These extracts provide a more subtle and complementary aroma without the strong savory notes of tadka spices.