Slow Cooker Pulled Pork Tacos

• 1.7 kg roast pork shoulder, boneless
• 30 g Mexican taco spice mix
• 400 g tin diced tomato
• 12 corn tortillas
• 1 lettuce baby cos, shredded
• 1 lime fresh, cut into wedges
• 2 tomatoes, diced
• 0.5 red onion, diced
• 0.25 cup cup coriander (cilantro) fresh