Sunday Morning Sardine Mustard Red Onion Spinach Sourdough Sandwich

Sardines, mustard, magic sauce, sourdough Sunday sandwich toast with red onion+lettuce or spinach for breakfast. Magic sauce is my homemade concoction of buttermilk, sriracha, mayo, sunflower seeds, Italian red wine vinegar, fresh garlic, all buzzed in the blender. I also add horseradish...