Moroccan aubergine salad

. 600 – 800 g aubergines (3 medium or 2 big ones ) . 1 Tbsp fine sea salt . 20 g lemon juice (about 1 lemon) . 1 medium onion (about 80 g), peeled and halved . 2 – 3 garlic cloves, peeled . 350 – 400 g tomatoes, halved (or 1 tin peeled…