If you have a sweet-tooth and a soft corner for Chocolate in your heart, you should hop over to Dairy Don in Matunga right now. They serve a range of thick chocolate shakes and you don't want to miss. You can also add flavours to your shakes like Coffee and Dark Chocolate or even Chocolate Chips.
Hot Chocolate Is A Passe, Try This Cold Coco Instead At Dairy Don In Matunga
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Try their Kulfi and Icecream Sandwich too. They have a range of flavours like Chilli Guava and Gulab Jamun in Kulfi.
They have branches in Mumbai. You would want to figure which is the closest to you.