Cut the bottom of the heads of lettuce off and carefully seperate leaves. Place leaves on a plate or serving dish.
Mince garlic by pounding it with the side of your knife or using a mortar. Add in salt.
Whisk together the lemon zest and juice with the garlic salt mixture.
Add in mustard and oil. Whisk until combined
Drizzle dressing over lettuce leaves.
Sprinkle with cheese and croutons
Add pepper if wanted.
Notes
Make sure to use freshly grated Parmesan cheese. The recipe calls for 1/3, but you can add more or less to taste.You can use whatever kind you like, but if you want to be able to pick it up with your fingers you will need to use romaine but the dressing is delicious on any kind of lettuce or spinach