Tomato Napoleon with Chive Vinaigrette

Ingredients

• 1/4 cup (60 ml) olive oil
• 1/4 cup (10 g) chopped fresh chives
• 3 tbsps (45 ml) lemon juice
• 1 tbsp shallot, finely chopped
• 1 tsp (5 ml) mustard
• 1 tsp sugar
• Fleur de sel
• 4 tomatoes of different colours, yellow, red, orange and black, cut into 1/2-inch (1-cm) slices
• 1 ball 250 g mozzarina, cut into 1/4-inch (1/2-cm) slices
• 16 thin baguette slices, cut diagonally, brushed with olive oil and grilled