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heat 2 tbsp. oil in a large skillet over medium heat
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cook shallot until just softened and golden, about 2 minutes.
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add tomatoes with their juices, salt & pepper, and 1/4 cup water.
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increase heat to high, bring to a boil, and cook until sauce thickens slightly, about 5 minutes. reduce heat to low, add spinach, beans and pesto and cook, stirring, until spinach wilts, 2–3 minutes.
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taste and adjust seasoning if needed, then divide bean mixture between 4 large, shallow bowls.
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wipe out skillet.
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heat remaining 1 tbsp. oil in skillet over medium-high.
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add shrimp and remaining 1/4 tsp. salt and 1/4 tsp. pepper.
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cook, stirring often, until shrimp is cooked through and starting to take on a little color on both sides, about 3 minutes.
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divide shrimp between bowls with beans; drizzle with additional pesto and a little olive oil.
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serve with toast alongside.