Chop your onion, basil, and garlic finely. Peel your cucumber and dice the cucumber and pineapple in roughly the same size.
Mix the pineapple, onion, and cucumber in a bowl.
Combine the vinegar, liquid jaggery, chopped basil and garlic, and the chilli flakes.
Drizzle over the pineapple mixture.
Mix well. Add a dash of olive oil on top. Leave in the refrigerator to marinate for an hour.
Garnish with coriander leaves, finely chopped, when serving.