Add 1 tsp (5 mL) oil to a large skillet over medium heat. Combine mushrooms, onion, and celery in the skillet and season with salt and pepper. Cook, stirring often, until veggies are softened.
Line a strainer with two sheets of paper towel and add the lentils and cooked veggies. Use the back of a wooden spoon or your hands to gently squeeze out any liquid, then place the mixture in a large bowl and discard the paper towel.
Add panko crumbs, Worcestershire, garlic powder, and oregano to the bowl. Stir until well combined.
In a separate bowl, make the glaze by whisking together hoisin sauce, lime juice and cilantro. Set aside.
Wipe out the large skillet with a paper towel, and place back on medium-high heat. Add the remaining 2 tsp (10 mL) oil.
Add flour to a small plate. With clean, dry hands, roll the lentil mixture into 2 Tbsp (30 mL) balls, then lightly roll each ball in flour. Add each ball to the skillet as you go.
Gently sear the lentil bites on each side until golden. Do not leave them unattended as they will burn quickly.
After all sides of the lentil bites are browned, pour sauce over all the bites and gently shake the pan to evenly coat them. Serve warm as an appetizer or as a meal alongside steamed veggies and rice. Garnish with additional chopped cilantro, if desired.