The Protein Mistake That's Holding Your Sandwich Back - Tasting Table
Briefly

The article emphasizes the importance of heating protein as the key factor to elevate homemade sandwiches. It suggests that properly heating proteins like chicken or deli meats enhances their flavor and juiciness, significantly improving the overall taste of the sandwich. Canned tuna and tofu also benefit from this technique, which involves the Maillard reaction, providing depth and richness. The article advises against simply grilling an assembled sandwich, as pre-heating the protein delivers superior results for classic American sandwiches.
The first step to a massively better sandwich begins with protein as the centerpiece, and perhaps your homemade sammies aren't hitting the spot because you're making the mistake of not heating up your protein.
Heating up the protein doesn't have to be rocket science, and you can admittedly do it in whatever way is most convenient at any given moment.
Bear in mind that heating up the protein on its own can't be substituted by simply grilling the whole sandwich once it's already assembled.
The heat also enhances the flavor, so if you're working with bland canned tuna or didn't have time to properly marinate tofu, heating them up will actually give those proteins some depth.
Read at Tasting Table
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