Preheat your oven to 350 degrees. Take your brioche slices and cut off the crusts, then cut diagonally to create triangles. Place into the oven until lightly toasted, about 5 minutes.
In a pan over medium-high heat, cook the bacon until crispy. Once rendered, add onion. Reduce heat to medium-low, and cook until the bacon fat, bacon, and onions combine. Season as you feel necessary with salt and pepper. Add the lemon juice and serve hot on the toast pieces.
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