Niçoise Tartine

Ingredients

• 1/2 red onion
• 1 tablespoon capers
• 1/4 cup red wine vinegar
• olive oil, for sprinkling and drizzling
• 1 clove garlic, cut in half
• 1 rustic loaf, cut into 1cm-thick slices
• 185 grams can tuna in spring water, drained
• 10 cherry tomatoes, sliced
• 6 green beans, blanched then cut into 1cm pieces
• 10 black olives (i used kalamata), pitted and halved
• 3 free-range eggs, hard-boiled and broken into even-sized pieces
• 1/2 cup micro greens