Unbreakable, the new film by M. Night Shyamalan, is in its own way as quietly intriguing as his The Sixth Sense.. It doesn't involve special effects and stunts, much of it is puzzling and introspective, and most of the action takes place during conversations.
Heat the waffle iron. In a medium bowl, sift the flour, salt, baking powder, and sugar. Set aside. In a small bowl, whisk together the eggs, milk, vegetable oil, and vanilla. When the waffle iron is ready to use, mix the wet ingredients into the dry ingredients. Stir until just combined. Stir in the strawberries. Do not overbeat. Pour batter into center of the waffle iron (amount will depend on the size of your waffle iron).
Gluten can also make baked goods tough if there is too much of it in the dough/batter, and excessive mixing of the dough can develop the gluten to this point. So when a recipe instructs you not to overmix, what it means is that you should just do the minimum amount of mixing necessary to make a uniform dough.