<ul>
<li>500g firm fish fillets (like salmon, cod, or tilapia), cut into cubes</li>
<li>1/2 cup thick yogurt</li>
<li>2 tbsp lemon juice</li>
<li>1 tbsp ginger paste</li>
<li>1 tbsp garlic paste</li>
<li>2 tsp garam masala</li>
<li>1 tsp red chili powder</li>
<li>1 tsp turmeric powder</li>
<li>1 tsp ground cumin</li>
<li>1 tsp ground coriander</li>
<li>Salt to taste</li>
<li>2 tbsp mustard oil or regular cooking oil</li>
<li>Fresh coriander (for garnish)</li>
<li>Lemon wedges (for serving)</li>
<li>Skewers (soaked in water if using wooden skewers)</li>
</ul>