Beef burrito served wet style

Name: Beef burrito served wet style
Ingredients: 3 red onions, diced; 3 cloves garlic, crushed; pinch of chilli flakes (adjust to desired spiciness); 2 tbsp smoked paprika, divided; 2 tbsp ground coriander seeds, divided; 3 tbsp cumin, divided; 1 can crushed tomatoes; 2 tins black beans, drained; 1 kg (2.2 lbs) beef rump, cut into strips; 2 tbsp olive oil, plus more for frying; salt, to taste; 4 tomatoes, diced; bunch of coriander, finely diced; zest and juice of 2 limes; 16 flour tortillas; 500g (1.1 lbs) mozzarella cheese, grated; 1/2 head iceberg lettuce, finely sliced