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Export 9 ingredients for grocery delivery
Step 1
In a fry pan, sauté chopped onions with a drizzle of olive oil over medium heat for a few minutes until golden. Then add rest of sauce ingredients and stir. Bring the sauce to a boil, then reduce to a simmer and cook for 3-5 minutes. Sprinkle arrowroot flour into sauce and whisk until sauce thickens (do not over cook, because the sauce will become too thick), then remove from heat.
Step 2
Add cooked spaghetti squash and tuna to sauce, combine, and serve!