Roast the cumin
Heat a cast-iron or steel skillet over medium heat. Add 1 tsp cumin seeds and stir constantly for about 1–2 minutes until the seeds smell fragrant and slightly darker. Keep a close eye; cumin burns fast and burns bitter. Remove the pan from heat.
Crush the seeds
Pour the toasted seeds into a mortar and pestle and crush roughly. If you don’t have one, place the seeds in a zip-top bag and crush with a rolling pin or the bottom of a heavy pan. Preserve a pinch for garnish if you like visual flair.
Prep the cucumber
Dice the cucumbers into very small cubes. If they hold a lot of water, toss them with a pinch of salt and rest them in a strainer for 5–10 minutes, then pat dry with paper towels. This step prevents watery raita — trust me, you want texture, not soup.
Whisk the yogurt
In a large bowl, whisk the thick vegan yogurt until smooth and slightly airy. Add the crushed cumin, chopped cilantro and mint, the chopped chili, and ½ tsp salt. Stir to combine.
Combine and finish
Fold in the drained cucumber cubes. Taste and adjust salt. Garnish with the reserved crushed cumin and a few mint leaves. Chill for 5–10 minutes or serve immediately.