Warm the skillet: Heat a tablespoon or two of olive oil in a medium skillet, over medium-high heat.
Sauté the aromatics: Add the diced onions, along with a couple pinches of salt, and cook until translucent. Throw in cherry tomatoes and garlic, and blister them until they are soft and have started to release their juices.
Add peppers: Add sliced bell peppers and chopped Scotch bonnet peppers. Continue cooking for about 5 more minutes, or until the peppers are tender.
Simmer with stock: Add in a splash of stock and let it gurgle gently for 7–10 minutes, reducing the liquid a bit.
Blend: Off the heat, transfer the mixture to a blender. With the machine running, stream in the remaining olive oil and blend on high speed until the sauce is thickened and emulsified. Adjust the salt and lemon juice to taste, and set the Mojo Rojo aside.