Place the blueberries in a small saucepan. Add 1/2 cup water, then stir in the honey. Heat over medium-high heat until the mixture comes to a low boil and the blueberries just start to break apart. Dissolve the cornstarch in 2 tablespoons cold water in a small bowl, then add the slurry to the saucepan and bring the mixture to a rolling boil. Turn the heat down and simmer on low heat until the sauce is nicely thickened, 2 to 3 minutes. Remove from the heat and stir in the lemon juice. Set aside until ready to serve.
Whisk together the flour, sugar, baking powder, baking soda and salt in a large bowl.
Whisk together the ricotta, milk, vanilla, eggs and lemon zest and juice in a separate medium bowl. Add the wet ingredients to the dry ingredients and stir with a wooden spoon until just combined.
Preheat the oven to 175 degrees F.
Heat about a Tbsp each vegetable oil and butter in a large nonstick or cast-iron skillet over medium heat. When the butter is foamy, reduce the heat to medium-low and ladle a heaping 1/4 cup pancake batter into the skillet. Repeat to make 2 more pancakes. Cook until bubbles start to form in the batter and the pancakes are golden underneath, about 3 minutes. Flip and cook the other sides until golden, another 3 minutes. Place the finished pancakes on a sheet tray and hold the oven while you finish cooking the remaining batter, adding more oil and butter as necessary. Serve warm with the blueberry sauce.
