Loaded Baked Potatoes (Vegetarian)

• 6 large potatoes
• 400 g tin black beans (drained)
• 400 g tin lentils (drained)
• 400 g tin corn kernels (drained)
• 400 g tin diced tomato
• 400 g water
• 20 g Mexican spice or taco spice
• 400 g tomatoes, chopped (to serve)
• 100 g parmesan cheese
• 1 lime, cut into wedges (to serve)