Mix the lemon juice and olive oil.
Ground some black pepper onto the tuna steaks.
Baste the tuna with the lemon-olive oil mixture and leave for 40 minutes to marinade.
Heat the oils in a pan over medium heat.
Add the onion and fry until soft.
Add the garlic, chilies and cumin and fry until fragrant.
Add the sweet pepper, dill, lemon juice and capers and season with salt and black pepper.
Cook over low heat for 10 minutes.
Heat some oil in a griddle pan and fry the tuna on both sides according to your preference.
Top with the topping and serve immediately with cooked baby potatoes, potato mash or chips and a salad.
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