In a small pot combine mayo, mustard, a gentle squeeze of lemon juice (save a little to adjust later) and salt & pepper.
In a mixing bowl add tuna, spring onion, parsley, dill pickles and all of the dressing. Stir until evenly combined, then taste test for seasoning & acidity. Adjust with salt, pepper & lemon juice if needed.
Spread one side of each slice of bread with butter. Top 3 slices with a lettuce leaf, then add cucumber and tomato slices. Top with tuna salad and add second slice of bread. Slice in half and enjoy!
Quick Demo
Notes
a) Extras 'n' Optionals for tuna salad - Capers make a great sub for pickles. If you want it slightly sweeter then pickle relish is nice. Red Onion makes a great sub for spring onion (~1/4cup finely diced red onion, but work to preference). If you want a more powerfully herby flavour then a tsp or so of dill works great!b)Extras 'n' Optionals for sandwich - You can leave out tomato and/or cucumber. Avocado works really well!c) Can I make this ahead of time? - You can make the salad part ahead of time, just tightly cover in the fridge for 2-3days. It does tend to go slightly watery, so I recommend stirring through a dollop of mayo just before serving, just to bring it all back together again.d) Calories - per sandwich assuming 2 tsp butter per sandwich is used:
* Percent Daily Values are based on a 2000 calorie diet.
*Nutrition is based on the absence of salt unless stated as a measurement in the ingredients. Cost is worked out based on ingredients bought from UK supermarkets, then divided by the number of servings. In both instances these values are just for guidance. Please check out my FAQ Page for more info.