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Export 8 ingredients for grocery delivery
Step 1
Heat olive oil in a large skillet.
Step 2
Add garlic, sauté until flavor is released, about a minute.
Step 3
Sauté onion until softened.
Step 4
Stir crushed tomatoes, tomato paste, red wine, salt, pepper, and red pepper flakes into crockpot.
Step 5
Add onion.
Step 6
Cook on low heat 4 hours. (I'm recommending four hours as a median time. It can be cooked more or less--I've made it in two hours, as well as let it cook for up to eight, and it was delicious each time. The original recipe calls for preparation over a stove with the instruction to "simmer until you can't stand it"--so it's really up to you.).