1.For sweet and sour sauce, combine ingredients in a small saucepan; cook, stirring occasionally, over medium heat until thickened slightly (5-6 minutes).
2.Meanwhile, combine eggplant, shallots, zucchini, pineapple, oil and turmeric in a bowl; season to taste. Thread vegetables evenly on skewers.
3.Heat a lidded barbecue or char-grill pan to high. Add skewers and close barbecue lid or cover char-grill pan loosely with foil. Cook, turning occasionally until charred and cooked through (10-12 minutes). Brush skewers generously with sauce and continue cooking until caramelised (3-5 minutes).
4.Meanwhile, for sambal, heat oil in a large frying pan over medium-high heat. Add curry leaves, mustard seeds, ginger, and chilli; cook until fragrant (30 seconds). Add coconut and kale; cook until slightly wilted (2-3 minutes); stir through lime juice and season to taste.
5.Serve skewers with coconut and kale sambal and scatter with cashews and micro lemon balm.
If freshly grated coconut is unavailable, rehydrate 80gm desiccated coconut with 1 tbsp warm water; stand for 5 minutes.
Jaggery is a caramel- tasting unrefined sugar, typically made from sugar cane sap or date palm sap. It’s available from Indian or Asian grocers. If it’s unavailable, substitute a medium-coloured palm sugar.