While the potatoes are boiling, start preparing the bravas sauce by heating olive oil on a medium-sized saucepan over medium heat.
Add garlic and onion and cook until the onion turns soft.
Add cayenne, cumin, sweet and hot smoked paprika.
Adjust the heat to medium-low and cook the spices for about two to three minutes, mixing continuously.
Add the crushed tomatoes, then bring the heat back to medium and combine.
Add the sherry vinegar, salt, and pepper, and mix.
Cover the spicy sauce and let it simmer for about 20 minutes.
Taste and adjust the seasoning and spices of your bravas sauce.
Take the pan off the heat and use an immersion blender to puree the sauce.