Tostadas de Atún con Aguacate (Tuna and Avocado Tostadas)
Crisp tostadas topped with zesty tuna, creamy guacamole and a drizzle of red salsa for a fast Mexican lunch.
Made with Salsa roja (cooked red salsa) and Classic guacamole and Tostadas and totopos (tortilla chips). Make a batch of the base first, then this takes minutes. Skip to the method
- Time15 min
- LevelEasy
- Costabout £1.98 a head
Cost is worked out from Aldi and Tesco shelf prices in October 2026. Your shop and brands will differ.
Ingredients
Tick what you need to buy. It goes on your shopping list.
Method
- 1
Flake the drained tuna into a bowl. Add the red onion, tomato, coriander and lime juice, season with salt and mix lightly with a fork.
- 2
Taste and add more lime or salt. The tuna should taste fresh and bright, not heavy.
- 3
Spread a layer of your ready made guacamole (see the base recipe) over each tostada, right to the edges, so it seals the surface and keeps the tostada crisp.
- 4
Pile the tuna mixture on top.
- 5
Spoon over your ready made salsa roja (see the base recipe), using about 1 tbsp per tostada.
- 6
Serve straight away, two tostadas per person, as the base softens within about 10 minutes.
Tips
- Drain the tuna very well and pat it dry. Excess water is the quickest way to a soggy tostada.
- Assemble just before eating. Keep each part cold and the tostadas dry until the last minute.
- Tinned tuna in olive oil gives a richer taste. Drain it well and cut back on the guacamole if you use it.
Storing and freezing
Eat straight away. The tuna mixture keeps for 1 day in the fridge in a covered container, but the assembled tostadas do not store.
Questions
Can I use fresh tuna?
Yes. Sear a tuna steak for 1 minute each side, rest it and dice it small, then dress it with lime and onion. Only use fish sold as suitable to eat rare.
Can I make it ahead for a party?
Prepare the tuna mix and guacamole up to 4 hours ahead, covered in the fridge. Assemble on the tostadas at the last minute.
What can I use instead of tuna?
Cooked prawns, shredded poached chicken or mashed black beans all work. Dress them in lime and salt in the same way.
More made with salsa roja (cooked red salsa)
Double check before you cook. Recipes can contain mistakes. Any diet labels come from the ingredients as written in this recipe and are a guide, not a guarantee. Always check every ingredient and the packet label for allergens and cross contamination, and ask your doctor or dietitian what is right for you, especially with coeliac disease, diabetes or a serious allergy. This is not medical advice.