>> source: Serious Eats
>> servings: 16
>> time: 60 minutes

In a #3-quart saucepan{}, heat @extra-virgin olive oil{120%ml} over medium-high heat until shimmering.

Add @garlic{5%cloves} minced, @yellow onions{4%medium} finely diced, @green pepper{1%large} stemmed, seeded, and finely diced, @red pepper{1%large} stemmed, seeded, and finely diced, and @leek{1%medium} washed and finely diced (optional).

Season lightly with kosher salt to taste and cook, stirring, until vegetables have released their liquid and are beginning to brown lightly on the bottom of the pan, about ~{10%minutes}.

Stir in @tomato paste{2%tbsp} and continue cooking until incorporated.