Preheat oven to 400 degrees. Quarter tomatoes lengthwise. Cut potatoes into 1/2-inch cubes. Halve, peel, and dice onion into 1/2-inch pieces.

Spread out tomatoes on a lightly oiled baking sheet. Season with salt and pepper. Roast in oven until soft and jammy, 15-20 minutes. Meanwhile, bring 2 cups of water and a pinch of salt to a boil in a small pot.

Place half the bacon from the package in a large, empty pan over medium-high heat (use the rest as you like). Cook until bacon is crispy, 3-6 minutes per side. Remove from pan and set aside to drain on paper towels. Keep any rendered grease in pan.

Add potatoes and onion to same pan. Cook, tossing, until potatoes are crisp and onion is very soft, 15-20 minutes. (TIP: Add a drizzle of oil if pan seems dry.) Season with salt and pepper. Stir spinach into pan, tossing to wilt. Season with salt and pepper.

Once water is boiling, slowly pour grits into pot while whisking to combine. Lower heat and reduce to a simmer. Cook until grits are thick and creamy, about 10 minutes. Stir in 1 TBSP butter and season to taste with salt and pepper. TIP: If grits become stiff, add a splash of water to loosen.

Divide grits between plates and top with hash and tomatoes. Crumble bacon over top and serve.