Preheat the oven to 220C, fan-forced. Line a large oven tray with baking paper. Finely chop the tomato and onion. Pick the coriander leaves and finely chop the stems. Crush or finely chop 2 garlic cloves.
Step 2 — Make tomato salsa
Combine 2 tsp olive oil and 1 tsp red wine vinegar in a bowl and season with salt and pepper. Add the tomato and half the onion and toss to combine.
Step 3 — Bake chipotle tortillas
Combine half the chipotle (see Make it milder) and 1 tbs olive oil in a bowl. Brush both sides of the tortillas with the chipotle mixture and put on the lined tray (don't worry if they overlap slightly). Bake the tortillas, turning halfway, for 8-10 mins until puffed and golden.
Step 4 — Cook lamb mince
Meanwhile, heat 2 tsp olive oil in a medium frypan over high heat. Cook the lamb mince, coriander stems, garlic and remaining onion, breaking up the lumps with a spoon, for 3 mins or until browned. Add the remaining chipotle and 1 tbs tomato paste*, season with salt and pepper and cook, stirring, for 2-3 mins until well combined. Remove the pan from the heat.
Step 5 — Serve up
Drain the tomato salsa, reserving the liquid. Combine the reserved salsa liquid and 2 tbs mayonnaise in a bowl. Divide the chipotle tostadas among plates and top with the lamb mixture, tomato salsa and coriander leaves. Drizzle with the mayo mixture and enjoy!
Step 6 — Make it milder
We've suggested this amount of chipotle for a chilli kick, but if you have little ones, simply brush their tortillas with olive oil only, and reduce the chipotle in the lamb mixture to taste.