1 garlic clove, finely grated
1 lemon, juice only
300g/10Β½oz sweet lettuce, such as cos, oakleaf or lamb's lettuce
1 heaped tsp Dijon mustard
4 anchovies in oil, drained, reserving 1 tbsp of their oil
2 tbsp mayonnaise
4 tbsp extra virgin olive oil
4 tbsp finely grated Parmesan, plus extra for serving
1 slice stale sourdough bread (roughly 100g/3Β½oz)