Check items off while grocery shopping - it’s remembered here.
Slice 1 tomato into round horizontal slices, arrange on a plate, mix 1T olive oil, 1T white wine vinegar, 1t whole grain mustard, pour over, and let marinate.
Toast sourdough brushed with olive oil, then top with mayonnaise, the marinated tomato from step 1, and avocado. Finish with Maldon salt, pepper, lemon juice, and olive oil.