In a small bowl, combine 3tbsp olive oil, lemon juice, mustard, salt and pepper; whsik well until combined.
In a large bowl, gently stir together roasted cauliflower, freekeh, currants and lemon zest. Drizzle with the dressing and mix until all ingredients are evenly coated. Taste and adjust the seasonings. Stir in the mint, just before serving.
Serve cold or at room temperature. Any leftovers can be stored in an airtight container for up to 3 days.