Crunch Into These Cured Salmon Tostadas!

Ingredients

• 1 fennel
• 1 blood orange
• 1 large lime
• 1 sour orange
• 2 radishes
• 10 fresh picked mint leaves
• 1/3 cup extra virgin olive oil
• 1 cup mayonnaise
• 1 teaspoon Dijon mustard
• 1 tablespoon sour cream
• Juice and zest of 1 large lime
• 1/2 teaspoon cayenne pepper
• 1/2 teaspoon sweet smoked paprika
• 1/2 garlic clove
• 4 yellow corn tostada shells
• 1/2 pound fresh sliced sushi-quality salmon, or gravlax (cured salmon) or smoked salmon