Ceviche - Vegan Mexican Food

Ingredients

• 1 cauliflower , small-medium head
• 2 cups tomatoes , small dice
• 1 cup red onion , small dice
• 1 cup cilantro , chopped
• 1 cup cucumber , small dice
• ½ cup fresh lime juice
• 1 chile serrano (if you like it spicy you can add more)
• 1 teaspoon salt
• 1 teaspoon fresh black pepper
• 1 tablespoon ketchup
• Tostadas
• 2 avocados , pits removed, sliced